How to pronounce “crenellate” in English

But there a logically necessary reason why we are doing it in crochet.And that's because all these frilly, crenellated forms that you see here, they are crochet invocations of a kind of geometry called hyperbolic geometry.And that is the geometry that is naturally realized in a lot of coral reef organism, like sponges and kelps and corals that you see here.