Here's a stumper for ya: My grandparents had one of these things, and I've never been able to find another one like it.
It was a plastic rectangle, about 8x10". Inside was and oil/water mixture. Also inside were several shapes that were fixed inside, so they didn't move around. You tip the rectangle on one end, and the oil would move from the top to the bottom, hitting these plastic shapes and therefore it would split, be rejoined, go down steps, etc. Once the oil collected at the bottom, you'd flip it back over and watch the oil go the other way. I also remember it being tinted red, and the oil was a bluish color...
It's similar to those wave machines and other oil toys you see today, but this was a specific one that I used to play with as a kid.
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