The slightly-tenuous links between the picture on the @cs4fn.bsky.social Christmas Computing Advent Calendar window and the post's content continues :)

Day 4 has an ice skate and the post is about detecting neutrinos at the South Pole & figure-skating motion capture https://cs4fn.blog/2023/12/04/cs4fn-advent-2023-day-4-ice-skate-detecting-neutrinos-at-the-south-pole-figure-skating-motion-capture-frozen-and-a-puzzle/