Great job that kept me occupied for the Summer of 2020 and Covid life - Programming For Cats by Scott Wlaschin. I'm alergic to cats and unfamiliar with them as a result, so I asked cat loving friends to send me photos and they did not disappoint! After some time spent getting to know Cats, I was raring to go :)

About 70 pix in all, here are a handful.

And here are some of the preparatory drawings...