I was reading something about jigsaw puzzles that reminded me of a very difficult puzzle I did a long time ago that consisted of a white baby seal on an ice floe. Almost the entire puzzle was shades of white with just the seal’s eyes and nose being black. The image below is not from the puzzle but you can see why such a puzzle would be difficult.
While thinking about it, I was reminded of the cruel practice of killing baby seals, usually by beating their heads in with clubs, because their white fur is valuable.
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