This intrigues me although I'm convinced almost anything that touches water is more expensive than I'm willing to pay for a hobby/pastime, but I went and looked

This intrigues me although I'm convinced almost anything that touches water is more expensive than I'm willing to pay for a hobby/pastime, but I went and looked up to see how these work. Neat. https://www.youtube.com/watch?v=Ub563Yc3xls https://www.youtube.com/watch?v=Ub563Yc3xls