KNOBBED CYLINDER LESSON 

In The Montessori Method by Maria Montessori, she says that children the age of 2-3 love repeating this exercise many times. Older children (3-4) also benefit from this game, but don't have the need to repeat it so many times. (Also, in her instructions, the cylinders are to be mixed up and then replaced.)

when do you start this lesson at home? after such-and-such is learned.... before such-and-such is learned... after a certain age?