Sol Lewitt, ‘Wall Drawing #797’
Instructions: The first drafter has a black marker and makes an irregular horizontal line near the top of the wall. Then the second drafter tries to copy it (without touching it) using a red marker. The third drafter does the same, using a yellow marker. The fourth drafter does the same using a blue marker. Then the second drafter followed by the third and fourth copies the last line drawn until the bottom of the wall is reached.
John Baldessari
‘Baldessari Sings LeWitt‘ (1972)
“No. 5:
Irrational thoughts… should be followed absolutely illogically”
(Thanks Laurent.)