Enigma 373: Date the painting
2 December 2016
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From New Scientist #1522, 21st August 1986 [link]
(R = Red, B = Blue, G = Green, Y = Yellow)
You will no doubt have recognised this as the latest masterpiece by the artist Pussicato, which has just gone on display at the National Gallery. I visited Pussicato in his studio at the end of March, just before he began work on the picture. He showed me the canvas divided into 36 squares which were numbered 1 to 36. He planned to paint the squares in order, one per day starting with square 1 on 1 April, using the four colours in strict rotation. He had numbered the squares so that from one day to the next he always moved to an adjacent square either horizontally or vertically; also, squares 1 and 36 were similarly adjacent. As I looked at the canvas, I pointed to two horizontally adjacent squares and remarked that the right-hand one contained a number which was 8 times the number in the left-hand square. Pussicato had no reply.
On what date did Pussicato paint the top left hand square of the picture?