Drop the little iceberg into a bowl of water and wait. Somewhere around the twelve hour mark the ice begins to break apart, and by twenty four hours a shaggy white and blue yeti has climbed out of it.

Keep the container topped up and he carries on swelling for another day or two, until he stands roughly four inches tall at about three times the size he started. It is the slowest and most satisfying kind of magic trick, the sort a child checks on before breakfast and again the moment they get home.

Toysmith grades it for ages 5 and up. The water has to stay under 95F, and the box is clear that he is not a bath toy. A stocking stuffer that keeps paying out for the better part of a week.