@Robby Findler : I see what you mean. But in this example given by Paul Ojanen (require 2htdp/image) (require 2htdp/universe)
(define BACKGROUND (rectangle 100 100 "outline" "white")) (define TRI (triangle 35 "solid" "blue")) (define (render ang) (place-image (rotate ang TRI) 20 20 BACKGROUND)) (define (tock ang) (modulo (+ ang 10) 360)) (big-bang 0 (on-draw render) (on-tick tock)) The triangle is not being consistent by keeping its center point on the center of BACKGROUND. Hopefully, this makes sense.
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