Left side: a perfectly normal binary tree data structure where each node has at most two children. Right side: literally the same tree but with a pride flag background and suddenly it's "non-binary."
The punchline works on multiple levels - it's both a play on computer science terminology and gender identity terminology. The tree didn't change at all, just its presentation. Kinda like how we've been using the same algorithms for decades but keep rebranding them as revolutionary breakthroughs.