Probably Art # 226: Circle

43 circles drawn in 8 shade(s) chosen from 4 unique size(s).

$$ s = .00429924, \; $$ $$ | \lbrace \theta \rbrace | = 8, $$ $$ | \lbrace r \rbrace | = 4,$$ $$ r_0 = 0.0500,$$ $$ R = 1.62, $$ $$r \sim \beta(0.183, 0.663), $$ $$\theta \sim \beta(1.530, 0.625). $$