In this model, a glass pipe is filled with a liquid. The word CHOICE and SELECTION are written on a paper and placed under the liquid. When the words are inverted and seen through the liquid, the word SELECTION changes but not the word CHOICE. This is because of a mathematical concept known as symmetry. Some of the English letters appear the same even when inverted.

Factorization of trinomials of the type ax2+bx+c can be illustrated with factorization blocks. It comprises a few squares of side 'x' units. The number of squares is optional. Then we have several rectangular strips of length 'x' units and breadth one unit. There are also a number of squares of length one unit. The thickness of all the pieces must be the same for good visual appeal.

This is one of the most popular theorems in geometry for several centuries now. This theorem found a place in the Guinness Book of World Records for having more than 400 proofs. This model demonstrates that the sum of the area of the two triangles on the sides of a right-angled triangle is equal to the area of the triangle on the hypotenuse.