Christmas Cactus

I spent from 10.00 till 14.30 assessing an online CELTA course on Zoom. I wasn’t online all that time, but it’s difficult to do something productive in a 15 or 30 mins break. During one break, I went to buy milk and in another one made myself a sandwich. And in another one, went out into patio to take a pic of our Christmas cactus doing its thing. How does it know? :-)