I made this the other day!
It's a polar space-time diagram, visualizing a train route's timetable throughout 24 hours of a weekday. The inside of the donut is one end station at s = 0km, and the train moves from station to station (the grey rings at 10, 21,... km) towards the other end station (at 50km), where it turns around and goes the other way. Outbound trains in red, inbound in blue. There's one train that goes end to end each half hour, and another train that goes halfway and back again every twenty minutes, creating this braided inner donut look.
Made it by mangling a timetable in Excel, loading it into Python with Pandas and visualizing it with Matplotlib which can do weirdass plots like this because ofc it can. cc kleinbl00 can I order this as a GMT clock kthxbaii
Other creative project of mine is that I'm learning Reaper and making electronic music with fortnightly private lessons. My track so far is still unquestioningly in the ass-sucking phase, but I feel like I'm really quick at picking up the ropes.