Probably Art # 132: Circle

7 circles drawn in 8 shade(s) chosen from 2 unique size(s).

$$ s = .01542461, \; $$ $$ | \lbrace \theta \rbrace | = 8, $$ $$ | \lbrace r \rbrace | = 2,$$ $$ r_0 = 0.0500,$$ $$ R = 1.00, $$ $$r \sim \beta(1.998, 0.437), $$ $$\theta \sim \beta(0.547, 1.084). $$