I'm working through "The algorithmic beauty of seashells" by Hans Meinhardt and it's fantastic. It's been on my list for quite a while, but I only got around to it about 2 months ago. I'm through the first 90%, which means I got through the seashell pattern modeling. I'm reading the last part more slowly, both because it's not building up the model and because I'm building an interactive implementation of the models.

I'm also reading Seveneves by Neal Stephenson. Started less than a month ago, am at p256/867. It's not my 'priority book', but I've been enjoying it when my brain needed a break from the seashells.