He's so pretty. But eventually he metamorphoses into an easily-overlooked little moth called the spotted tussock moth (lophocampa maculata).
Same with this guy, who I noticed near our front door. The oak tree is right there, so he may have come down from it. I sort of harassed him, actually, since he wasn't much into photography.
I was able to catch his annoyed expression before I left him alone, which was, really, all he asked. He'll become a banded tussock moth, also called a pale tiger moth or a pale tussock moth. You can't have too many names! His official name is halysidota tessellaris.
I would think that a fancy caterpillar ought to result in something equally fancy once it emerges from its cocoon. But both these caterpillars are much prettier and more striking in this stage of their lives than later, when they turn into little brownish moths with patterns so subtle as to be noticed only by the most devoted mothologist. A case of peaking early, maybe.