Probably Art # 65: Circle

38 circles drawn in 2 shade(s) chosen from 4 unique size(s).

$$ s = .00546103, \; $$ $$ | \lbrace \theta \rbrace | = 2, $$ $$ | \lbrace r \rbrace | = 4,$$ $$ r_0 = 0.0500,$$ $$ R = 3.00, $$ $$r \sim \beta(25.000, 39.000), $$ $$\theta \sim \beta(5.000, 2.000). $$