I am on the train to Carinthia again and this is an image that I took in the morning.
Letting three lines go through three corners is no problem, once you’ve understood it, it is really easy. Not so with four lines and four corners though. If you think of it, this is related to why tripods are so stable and quadropods are … not.
The Song of the Day is “Skip The Gutter” by Louis Armstrong And His Hot Five. Hear it on YouTube.