4 blocks, eac containing 10 cylinders with knobs, each cylinder fitting into respective hole.

The four blocks varying in one, two or three dimensions

Block 1: The cylinders are equal in height, but decrease in diameter. Two dimensions vary length and width and diameter

Block2:The cylinders decrease in height and diameter. Three dimension vary lenght, width and height.

Block 3:The cylindersincrease in height while decrease in width. Three dimensions vary in lenght, width,and height(diameter and height)

Block 4: The cylinders are equal in with, but decrease in height. One dimension only, vary in height .