Humidity built the snowman, sunshine brought him down.
Where do you get the 1:2:3 proportion? It's in the Fibonacci series (:1,\;1,\;2,\;3,\;5,\;8,\;13,\;21,\;34,\;55,\;89) but you could go 2:3:5 or 13:21:34.
Roll at random so you don't get a cylinder.