An arithmetic progression with the bottom edge having an even number (2-4-6-8-10-12-14-16-18)and the top edge an odd number (1-3-5-7-9-11-13-15-17)allowing the bottom to progress steadily beyond the top.

Progression Piece

July 1973
Brentwood, Missouri
Oak and Steel
H: 5 in. x W: 9 ft. 1 in. x D: 3 in.

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