Jean Dubuffet

Banque de l'hourloupe

1967
The complete set of 52 screenprints in colours, on cardstock, the full sheets with gilt edges, with title page,
all S. 26.5 x 18.1 x 10.1 cm (10 3/8 x 7 1/8 x 3 7/8 in.)
annoted 'AP 3/30' in ink on the back inside cover of the box (one of 30 artist's proofs, the edition was 350), each sheet also chronologically numbered and titled on the reverse, published by Editions Alecto Ltd., London, in very good condition, contained in the original black canvas-covered portfolio with screenprinted title on cover and spine.

Estimate
£1,000 - 1,500 ♠

Sold for £5,625

Contact Specialist
Robert Kennan
Editions, London
rkennan@phillips.com
+44 207 318 4075

Evening & Day Editions

London 12 December 2013 2pm & 6pm

1
James Ensor
Masques intrigues
Estimate £6,000 - 8,000 ♠
2
Paul Klee
Hoffmanneske Szene
Estimate £15,000 - 20,000 ‡
3
Pablo Picasso
Visage de Marie-Thérèse
Estimate £25,000 - 35,000 ‡♠
Sold for £37,500
4
Salvador Dalí
Le cabinet anthropomorphique
Estimate £10,000 - 15,000 ♠
Sold for £12,500
5
Man Ray
L'Étoile de verre (Glass Star)
Estimate £10,000 - 15,000 ♠
6
This lot is no longer available.
7
Andy Warhol
In the Bottom of my Garden
Estimate £12,000 - 18,000 ‡
8
David Hockney
Illustrations for Fourteen Poems by C.P. Cavafy
Estimate £12,000 - 18,000 ♠
Sold for £27,500
9
Sir Peter Blake, R.A.
Alphabet
Estimate £12,000 - 18,000 ♠
10
Various Artists
Edition Original 1, das grosze buch
Estimate £30,000 - 50,000 ‡♠
11
Richard Hamilton
Fashion-Plate (Cosmetic Study IX)
Estimate £150,000 - 200,000 ‡♠
Sold for £314,500
12
Andy Warhol
Electric Chair
Estimate £20,000 - 30,000
13
Robert Indiana
Stainless Steel Numbers: Two
Estimate £40,000 - 60,000 ‡
Sold for £50,000
14
Robert Indiana
Book of Love
Estimate £25,000 - 35,000 ‡
Sold for £31,250
15
Andy Warhol
Self-Portrait
Estimate £60,000 - 80,000 ‡
16
Andy Warhol
Jacqueline Kennedy I (Jackie I), from 11 Pop Artists, Volume I
Estimate £5,000 - 7,000 ‡
Sold for £10,625
17
Andy Warhol
Flowers
Estimate £15,000 - 20,000
Sold for £35,000
18
Andy Warhol
Castelli Gallery Marilyn Invitation
Estimate £8,000 - 12,000
Sold for £7,500
19
Michelangelo Pistoletto
Autoritratto (Self-Portrait)
Estimate £7,000 - 9,000 ‡♠
Sold for £12,500
20
Ed Ruscha
News, Mews, Pews, Brews, Stews & Dues
Estimate £7,000 - 10,000
Sold for £18,750
21
Wayne Thiebaud
Gumball Machine
Estimate £8,000 - 12,000
Sold for £10,000
22
Roy Lichtenstein
Tel Aviv Museum Print
Estimate £20,000 - 30,000 ‡
Sold for £47,500
23
Roy Lichtenstein
Imperfect 67" x 79 7/8", from Imperfect series
Estimate £15,000 - 20,000 ‡
Sold for £18,750
24
Roy Lichtenstein
Two Paintings: Beach Ball, from Paintings series
Estimate £12,000 - 18,000
Sold for £15,000
25
Robert Motherwell
Ulysses (additional suite of etchings)
Estimate £10,000 - 15,000 ‡
Sold for £12,500
26
David Hockney
Van Gogh Chair (White)
Estimate £10,000 - 15,000 ‡♠
Sold for £12,500
27
Richard Hamilton
Picasso's Meninas from Hommage à Picasso
Estimate £15,000 - 20,000 ‡♠
Sold for £21,875
28
Gerhard Richter
Frau mit Kind
Estimate £50,000 - 70,000 ♠
Sold for £98,500
29
Francis Bacon
Miroir de la tauromachie: centre panel
Estimate £10,000 - 15,000 ♠
Sold for £12,500
30
Lynn Chadwick, R.A.
Three Standing Figures: One Figure
Estimate £7,000 - 10,000 ‡♠
Sold for £8,750
31
Lynn Chadwick, R.A.
Three Standing Figures: One Figure
Estimate £7,000 - 10,000 ‡♠
Sold for £7,500
32
Lynn Chadwick, R.A.
Three Standing Figures: One Figure
Estimate £7,000 - 10,000 ‡♠
Sold for £10,625
33
Julian Opie
This is Shahnoza in 3 Parts (1)
Estimate £10,000 - 15,000 ♠
Sold for £23,750
34
Andy Warhol
Letter to the World (The Kick), from Martha Graham
Estimate £12,000 - 18,000
Sold for £15,000
35
Keith Haring
Stones
Estimate £10,000 - 15,000
Sold for £30,000
36
Jean-Michel Basquiat
Untitled (from Leonardo)
Estimate £15,000 - 20,000
Sold for £30,000
37
Richard Prince
Good Nurse
Estimate £30,000 - 50,000 ‡
Sold for £37,500
38
Damien Hirst
The Souls on Jacob’s Ladder take their Flight
Estimate £20,000 - 30,000 ♠†
39
Damien Hirst
Happy
Estimate £20,000 - 30,000 ♠
Sold for £25,000
40
Gary Hume
The Sister Troop
Estimate £12,000 - 18,000 ♠
41
Damien Hirst
In a Spin, the Action of the World on Things volume II
Estimate £15,000 - 20,000 ♠
Sold for £20,000
42
Marcel Broodthaers
A Voyage on the North Sea
Estimate £6,000 - 9,000 ♠
Sold for £13,750
43
Christian Marclay
Telephones
Estimate £6,000 - 9,000 ‡
44
Cindy Sherman
Untitled (Doctor and Nurse)
Estimate £5,000 - 7,000 ‡
Sold for £5,000
45
Sarah Lucas
Self Portraits 1990 – 1998
Estimate £5,000 - 7,000 ♠
Sold for £6,000
46
Damien Hirst
Pharmaceuticals
Estimate £12,000 - 18,000 ‡♠
Sold for £20,000
47
Naum Gabo
Opus 8; Opus 8; Opus 10; and Opus 10
Estimate £5,000 - 7,000 ‡
Sold for £5,000
48
Henry Moore
Reclining Nude
Estimate £2,500 - 3,500 ‡♠
Sold for £3,750
49
Dame Barbara Hepworth
Sea Forms; Squares and Circles; Sun and Moon
Estimate £3,000 - 5,000 ‡♠
Sold for £3,750
50
Various Artists
Douze lithographies
Estimate £2,500 - 3,500 ♠
Sold for £3,125
51
Alberto Giacometti
Buste II
Estimate £2,000 - 3,000 ♠
52
Alberto Giacometti
Nu assis
Estimate £3,000 - 5,000 ♠
Sold for £4,000
53
Alberto Giacometti
Stampa
Estimate £2,000 - 3,000 ♠
54
Alberto Giacometti
L'Homme qui marche
Estimate £1,500 - 2,000 ♠
Sold for £1,875
55
After René Magritte
Le 16 Septembre
Estimate £1,500 - 2,000 ♠
Sold for £1,250
56
Henri Matisse
Odalisque, brasero et coupe de fruits
Estimate £6,000 - 8,000 ♠
Sold for £8,750
57
Louise Bourgeois
Le Lit Gros Edredon (With Lips)
Estimate £2,000 - 3,000 ♠
Sold for £3,250
58
Howard Hodgkin
Welcome, from Art and Sports portfolio (Winter Sports)
Estimate £700 - 1,000 ♠
Sold for £688
59
Niki de Saint Phalle
L’Arbre de Vie
Estimate £4,000 - 6,000 ♠
Sold for £10,000
60
Ben Shahn
All that is Beautiful
Estimate £1,000 - 1,500
Sold for £1,750
61
Joan Miró
for Bagatelles végétales: one plate
Estimate £1,500 - 2,000 ‡♠
Sold for £4,750
62
After Pablo Picasso
Three plates, from Verve Nos. 29-30
Estimate £5,000 - 7,000 ♠
63
Joan Miró
Le lézard aux plumes d’or: plate 9
Estimate £2,000 - 3,000 ♠
Sold for £1,875
64
Gerhard Richter
Victoria I; and II
Estimate £2,000 - 3,000 ♠
Sold for £6,875
65
Hans Hartung
Héraclite. Mieux vaut cacher sa deraison
Estimate £2,000 - 3,000 ♠
66
Victor Vasarely
Gaia
Estimate £2,000 - 3,000 ♠
Sold for £4,750
67
Anni Albers
Connections 1925/1983
Estimate £1,500 - 2,000
Sold for £1,875
68No Reserve
Victor Pasmore
Images of the World
Estimate £1,000 - 1,500 •♠
Sold for £438
69
Lucio Fontana
Concetto Spaziale
Estimate £1,500 - 2,000 ♠
Sold for £2,500
70
Richard Paul Lohse
Serigrafien
Estimate £700 - 1,000
Sold for £1,625
71
Josef Albers
I-S LXX a; and I-S LXX b
Estimate £1,500 - 2,000 ‡
Sold for £4,000
72
Lucio Fontana
Concetto Spaziale (rosso)
Estimate £5,000 - 7,000 ♠
73
Lucio Fontana
Concetto Spaziale (bianco)
Estimate £6,000 - 8,000 ♠
74
Enrico Castellani
Estroflessione
Estimate £3,000 - 5,000 ♠
75
Frank Stella
Empress of India II, from V series
Estimate £1,000 - 1,500
Sold for £3,125
76
Fred Sandback
22 Photostaten: six plates
Estimate £6,000 - 8,000
Sold for £7,500
77
Fred Sandback
Lithographie; and Lithographie
Estimate £2,000 - 3,000
78
Fred Sandback
Six Lithographs
Estimate £1,000 - 1,500
Sold for £2,000
79
Cy Twombly
Roman Notes: plate I
Estimate £6,000 - 8,000
Sold for £8,125
80
Cy Twombly
Untitled
Estimate £2,000 - 3,000
Sold for £6,250
81
Sol LeWitt
Straight Lines in Four Directions & All Their Possible Combinations
Estimate £6,000 - 8,000 †
82
Sol LeWitt
Stars
Estimate £4,000 - 6,000 †
83
Gerhard Richter
Seestück (Gegenlicht)
Estimate £3,000 - 5,000 ♠
Sold for £6,250
84
Gerhard Richter
Schweizer Alpen I: A2
Estimate £3,000 - 5,000 ♠
Sold for £3,750
85
Hiroshi Sugimoto
Time Exposed
Estimate £6,000 - 8,000
Sold for £10,625
86
Marc Quinn
Crystal World
Estimate £5,000 - 7,000 ♠
Sold for £11,250
87
Marc Quinn
Sleeping Beauty
Estimate £6,000 - 8,000 ♠
Sold for £16,250
88
Antony Gormley
Sublimate
Estimate £3,000 - 5,000 ♠
Sold for £3,500
89
Antony Gormley
Standing Matter
Estimate £3,000 - 5,000 ♠
Sold for £3,250
90
Antony Gormley
Horizon Field
Estimate £3,000 - 5,000 ♠
Sold for £3,250
91
Robert Longo
Jules
Estimate £3,000 - 5,000
Sold for £20,000
92
Robert Longo
Barbara
Estimate £3,000 - 5,000
Sold for £8,125
93
Martin Kippenberger
Yeschen-Nochen-Vielleichtchen
Estimate £5,000 - 7,000 ‡♠
Sold for £3,125
94
Ahmed Alsoudani
Untitled
Estimate £3,000 - 5,000
95
Francis Bacon
Second version of triptych 1944: left panel
Estimate £2,000 - 3,000 ♠
Sold for £4,750
96
Francis Bacon
Second version of the Triptych 1944: centre panel
Estimate £4,000 - 6,000 ♠
Sold for £12,500
97
Francis Bacon
Triptych 1986 – 1987: right panel
Estimate £3,000 - 5,000 ♠
Sold for £5,625
98
Francis Bacon
Figure Writing Reflected in Mirror
Estimate £4,000 - 6,000 ♠
Sold for £27,500
99
George Segal
Girl on a Chair
Estimate £4,000 - 6,000
100
David Hockney
Celia Observing
Estimate £2,500 - 3,500 ‡♠
Sold for £3,250
101
Ed Ruscha
Three Daughters
Estimate £2,000 - 3,000 †
Sold for £2,500
102
Ed Ruscha
Man Walking Away From it All
Estimate £2,000 - 3,000 †
103
Rufino Tamayo
Desnudo en Naranja (Nude in Orange)
Estimate £1,000 - 1,500 ♠
Sold for £1,375
104No Reserve
Brett Whiteley
Buddha
Estimate £1,500 - 2,000 •
Sold for £313
105
Richard Hamilton
A Little Bit of Roy Lichtenstein
Estimate £4,000 - 6,000 ♠
Sold for £6,875
106
This lot is no longer available.
107
Tom Wesselmann
Bedroom Blonde
Estimate £4,000 - 6,000
Sold for £8,125
108
Tom Wesselmann
Still-Life with Blowing Curtain (Yellow)
Estimate £3,000 - 5,000
Sold for £5,625
109
Andy Warhol
Electric Chair
Estimate £3,000 - 5,000
Sold for £4,375
110
Andy Warhol
Electric Chair
Estimate £4,000 - 6,000
Sold for £8,125
111
This lot is no longer available.
112
Jean Dubuffet
Banque de l'hourloupe
Estimate £1,000 - 1,500 ♠
Sold for £5,625
113
Michelangelo Pistoletto
Cartella A
Estimate £1,500 - 2,000 ♠
Sold for £2,750
114
Michelangelo Pistoletto
Cartella B
Estimate £1,500 - 2,000 ♠
Sold for £3,000
115
Sir Eduardo Paolozzi
Moonstrip Empire News; and General Dynamic F.U.N.
Estimate £3,000 - 5,000 ♠
116
Alex Katz
Brisk Day I; II; and III
Estimate £4,000 - 6,000 ‡
Sold for £10,000
117
Patrick Caulfield
Large Jug; Vessel; and White Ware Prints: seven prints
Estimate £4,000 - 6,000 ‡♠
Sold for £3,250
118
Patrick Hughes
Retroperspective; and Steps and Ladders
Estimate £3,000 - 5,000 ‡♠
119
Patrick Hughes
Indoors
Estimate £1,500 - 2,000 ‡♠
Sold for £1,625
120
JR
Tree and Moon from Women Are Heroes, Action dans la Favela Morro da Providência
Estimate £1,500 - 2,000 ♠
Sold for £2,250
121
JR
Stairs from Women are Heroes, Action dans la Favela Morro da Providência
Estimate £1,500 - 2,000 ♠
Sold for £1,500
122
Christo and Jeanne-Claude
The Mall near 5th Avenue (Full moon February 24)
Estimate £3,000 - 5,000
Sold for £3,750
123
Robert Longo
Men in the Cities
Estimate £1,000 - 1,500
Sold for £1,375
124
Keith Haring
Apocalypse 7, from Apocalypse series
Estimate £2,500 - 3,500
Sold for £3,250
125
Keith Haring
The King
Estimate £2,000 - 3,000
Sold for £3,500
126
Banksy
Choose Your Weapon (Dark Orange)
Estimate £5,000 - 7,000 ♠
Sold for £10,000
127
Banksy
Donut (Strawberry)
Estimate £3,000 - 5,000 ♠
Sold for £6,000
128
Jeff Koons
Balloon Dog (Blue)
Estimate £3,000 - 5,000
Sold for £11,250
129
Jeff Koons
Split Rocker Vase
Estimate £2,000 - 3,000
130
Jeff Koons
Girl with Lobster, from Re-Object Mythos
Estimate £5,000 - 7,000
Sold for £6,250
131
Mario Testino
Kate Moss, London, 2006
Estimate £2,000 - 3,000 ♠
Sold for £5,625
132
Marlene Dumas
Barbie (with pearl necklace)
Estimate £4,000 - 6,000 ♠
Sold for £5,000
133
Glenn Brown
Sympathy for the Poor
Estimate £5,000 - 7,000 ♠
134
Maurizio Cattelan
Permanent Food
Estimate £6,000 - 8,000 ♠
Sold for £5,625
135
Russell Young
Marilyn Goddess
Estimate £2,000 - 3,000 ‡♠
136
Robert Indiana
Love, from Book of Love
Estimate £1,500 - 2,000 ‡
Sold for £2,500
137
Martin Creed
CHICAGO (Work #1370)
Estimate £1,500 - 2,000 ♠
Sold for £1,625
138
Damien Hirst
Untitled, from Re-Object Mythos
Estimate £5,000 - 7,000 ♠
139
Joseph Kosuth
Wittgenstein's Colour
Estimate £4,000 - 6,000
Sold for £8,125
140No Reserve
Katharina Fritsch
St. Katharina
Estimate £3,000 - 5,000 •†♠
Sold for £5,250
141
Tauba Auerbach
Plate Distortion I; II; and III
Estimate £7,000 - 10,000
142
Christopher Wool
Untitled
Estimate £3,000 - 5,000
Sold for £8,750
143
Gary Hume
Spring Angels
Estimate £4,000 - 6,000 ♠†
Sold for £2,500
144
Damien Hirst
Aurous Iodide
Estimate £6,000 - 8,000 ♠
Sold for £10,625
145
Damien Hirst
Lysergic Acid Diethylamide (LSD)
Estimate £4,000 - 6,000 ♠
Sold for £6,875
146
Robert Gober
Untitled; Fresh Pig; and Whole Pig
Estimate £3,000 - 5,000 ‡
Sold for £3,750
147
Banksy
Gold Flag
Estimate £3,000 - 5,000 ♠
Sold for £3,750
148
John Armleder
Untitled
Estimate £1,000 - 1,500
149
John Armleder
Untitled
Estimate £1,000 - 1,500
150No Reserve
Vanessa Beecroft
Untitled (for Parkett 56)
Estimate £1,500 - 2,000 •♠
Sold for £1,063
151
Vik Muniz
Memory Rendering of John Lennon
Estimate £3,000 - 5,000 ‡
152
Vik Muniz
Memory Rendering of Trang Bang
Estimate £3,000 - 5,000 ‡
153
On Kawara
Thanatophanies
Estimate £1,000 - 1,500
Sold for £1,500
154
David Hammons
Money Tree (for Parkett 31)
Estimate £2,000 - 3,000 ‡
Sold for £2,500
155
Felix Gonzalez-Torres
"Untitled" (Oscar Wilde)
Estimate £800 - 1,200
Sold for £1,000
156
Mike Kelley
Goethe Quote (for Parkett 31)
Estimate £1,000 - 1,500 ‡
Sold for £1,250
157
Darren Almond
Norilsk
Estimate £6,000 - 8,000 ‡♠
158
Not Vital
Dirigerer Sibelius, Grieg, Carl Nielsen
Estimate £3,000 - 4,000 ‡
159
Julian Opie
View from my Bedroom Window
Estimate £1,500 - 2,000 Ω♠
Sold for £1,750
160No Reserve
Various Artists
Zoo
Estimate £2,000 - 3,000 •♠
Sold for £375
161
Thomas Struth
Making Time
Estimate £1,000 - 1,500 ♠
Sold for £2,000
162No Reserve
Maurizio Cattelan
The 1:6 Scale Wrong Gallery
Estimate £1,000 - 1,500 •†♠
Sold for £2,000
163
Yoshitomo Nara
Mori Girl
Estimate £5,000 - 7,000
Sold for £6,250
164
Takashi Murakami
Project Ko2 Perfect Edition
Estimate £4,000 - 6,000
Sold for £16,250
165
Yoshitomo Nara
Doggy Radio X Rimowa
Estimate £3,000 - 5,000
Sold for £3,750
166
Yayoi Kusama
The Me That I Adore (The Grand Set)
Estimate £2,500 - 3,500 Ω
167No Reserve
Takashi Murakami
Time Bokan (ten prints)
Estimate £5,000 - 7,000 •‡
Sold for £3,500
168
Takashi Murakami
Puka Puka
Estimate £4,000 - 6,000 ‡
169
Takashi Murakami and Mikakuto Collaborative Goods
Making a U-turn, the Lost Child Finds His Way Home
Estimate £2,000 - 3,000 ‡
170No Reserve
Takashi Murakami
Flower Ball (3-D) (ten prints)
Estimate £7,000 - 10,000 •‡
Sold for £18,750
171No Reserve
Takashi Murakami
Jellyfish Eyes - White 1; Jellyfish Eyes - White 2; Jellyfish Eyes - White 3; Jellyfish Eyes - White 4; Jellyfish Eyes - Black 1; Jellyfish Eyes - Black 2; Jellyfish Eyes - Black 3; and Jellyfish Eyes - Black 5
Estimate £4,000 - 6,000 •‡
Sold for £7,500
172No Reserve
Takashi Murakami
Even The Digital Realm Has Flowers To Offer; Warhol/Silver; Purple Flowers In A Bouquet; and Flowers for Algernon
Estimate £2,000 - 3,000 •‡
Sold for £3,125
173No Reserve
Takashi Murakami
Kansei Korin Gold; Kansei; Kansei Korin Red Stream; and Kansei: Skulls
Estimate £2,000 - 3,000 •‡
Sold for £2,750
174No Reserve
Takashi Murakami
Cosmos; CUBE; CUBE 2; Flower; and Flower 2
Estimate £2,000 - 3,000 •‡
Sold for £2,125
175No Reserve
Takashi Murakami
DOB Totem Pole; !N CHA!; Flowers Have Bloomed; Jellyfish Eyes Cream; and Jellyfish Eyes
Estimate £2,500 - 3,500 •‡
Sold for £1,500
176No Reserve
Takashi Murakami
With Reverence, I Lay Myself Before you - Korin - Chrysanthemum; I Recall the Time When My Feet Lifted Off The Ground, Ever So Slightly - Korin - Chrystanthemum; Kansei: Like The River's Flow; Kansei: Abstraction; and Kansei: Architect Of The Heart
Estimate £3,000 - 4,000 •‡
Sold for £2,500
177No Reserve
Takashi Murakami
Me and Mr. DOB; Kaikai Kiki And Me - The Shocking Truth Revealed; Kaikai Kiki And Me - For Better Or Worse, In Good Times And Bad. The Weather is Fine
Estimate £1,000 - 1,500 •‡
Sold for £1,625
178No Reserve
Takashi Murakami
And then and then and then and then and then (five prints)
Estimate £4,000 - 6,000 •‡
Sold for £5,625
179No Reserve
Takashi Murakami
Acupuncture/Flowers (Checkers); Acupuncture/Flowers; Open Your Hands Wide, Embrace Happiness!; and Field of Smiling Flowers
Estimate £1,500 - 2,000 •‡
Sold for £1,125
180No Reserve
Takashi Murakami
An Homage to IKB, 1957 B; An Homage to Monogold, 1960 B, An Homage to Monopink, 1960 B; and An Homage to Yves Klein, multicolor B
Estimate £2,500 - 3,500 •‡
Sold for £2,750
181No Reserve
Takashi Murakami
Such Cute Flowers; Flower Smile; and Flowers From The Village of Ponkotan
Estimate £1,000 - 1,500 •‡
Sold for £1,250
182No Reserve
Takashi Murakami
Maiden in the Yellow Straw Hat; If I Could Reach that Field of Flowers, I would Die Happy; Poporoke Forest; and Open Your Hands Wide
Estimate £1,000 - 1,500 •‡
Sold for £3,750
183No Reserve
Takashi Murakami
And Then, When That's Done… I Change. What I Was Yesterday Is Cast Aside, Like An Insect Shedding Its Skin; I know Not. I Know; Genome No. 10^7x2^122; A Picture Of The Blessed Lion Who Stares At Death
Estimate £1,000 - 1,500 •‡
Sold for £1,250
184
Takashi Murakami
Jellyfish Eyes
Estimate £4,000 - 6,000 ‡
Sold for £15,000
185
Takashi Murakami
Plush Flowerball
Estimate £3,000 - 4,000 ‡
Sold for £4,375
186No Reserve
Mark Grotjahn and Takashi Murakami
Untitled (Scarlet Lake and Indigo Blue Butterfly 826); and Untitled (Canary Yellow and Black Butterfly 830)
Estimate £1,500 - 2,000 •
Sold for £4,625
187
Yoshitomo Nara
Cosmic Girls
Estimate £1,000 - 1,500
Sold for £3,000

Evening & Day Editions

London 12 December 2013 2pm & 6pm

Literature

112

Jean Dubuffet

Banque de l'hourloupe

Evening & Day Editions