autumn colours

WFH. Spent the morning marking assignments. Pretty happy with what I have seen so far. I managed to get out briefly at lunch time to buy some bread and get some fresh air. Lecture in the afternoon. More marking afterwards. We are getting somewhere with the puzzle (see extra). It's not only difficult because of all the blue and white pieces. It turns out that the pieces themselves are very regular. They all have the same rough shape (except for the edge pieces).