each signed, inscribed, consecutively numbered and dated 'Allan McCollum 1989 8.25.89C M-13 - M-20' on the reverse

enamel on cast hydrostone

smallest 12.6 x 10.4 cm (4 7/8 x 4 1/8 in.)
largest 24.1 x 18.4 cm (9 1/2 x 7 1/4 in.)
overall installation dimensions approx. 24.1 x 142 cm (9 1/2 x 55 7/8 in.)

Executed in 1989.