I'm sure the seeds of my interest had already been sown: Like most kids, I loved making paper snowflakes, and I still love the expressions on kids' faces when they open up that pie-shaped paper they've been cutting. But if I had to guess, my very first glimpse of the amazing radial symmetry found in nature was probably this one—still one of the most elegant examples, to be sure—the star in the center of an apple.
If you're interested, here's a link to a fabulous page by someone who clearly loved his Spirograph as much as I loved mine. Did you have a favorite creative toy growing up? Let the nostalgia begin!