I was washing dishes the first time I noticed that moving water could cut through ice. There was a glass with some ice left in it from dinner. I was shocked at how fast running water would melt it even though it wasn’t hot. I got more cubes out of the freezer and spent an hour at the sink experimenting. I made all kinds of shapes and tunnels. The fun came to an end when my dad went to get a drink and there was only a single cube left in the tray.