Four sets of wooden cylinders corresponding in size to the cylinders of
Blocks 1,2,3 and 4 of the knobbed cylinders, each set a different colour.
The lid of each box can be used as a starting point for grading. The cylinders
can be placed on top of the lid as they cylinders are built into a tower.
This exercise is indirect preparation for writing as the thumb and two fingers are used in pincer grip to hold the cylinders.