What is the geometric pattern on an osage orange or hedge apple?

[femtosecond]

The hamsters wanted some fruit and ate the post. It’s not only squirrels liking the seeds. I’ll work from the title.

Two nice big pictures for those like me who have never seen it before.
http://www.mcmullans.org/canal/osage_orange.htm
http://members.iglou.com/perkins/newkpf/2001_11/home3507.htm

It’s an aggregate fruit, made from smaller parts that grew together. Here’s a page with a picture of its flowers: http://www.extension.iastate.edu/pages/tree/osage-or.html
http://waynesword.palomar.edu/jackfr1.htm

Multiple fruits of the mulberry family are composed of numerous, seed-bearing, ripened ovaries derived from numerous separate flowers. The multiple fruit of a mulberry (Morus) is composed of a cluster of drupelets superficially resembling a blackberry; however, unlike a blackberry, each drupelet arises from a separate minute flower.

and further down http://waynesword.palomar.edu/jackfr1.htm#osage

Like the breadfruit and jackfruit, it is a true multiple fruit composed of numerous separate ovaries, each arising from a separate female flower. In fact, the bumpy surface of the fruit is due to the numerous, tightly-packed ovaries of the female flowers.