Collatz Sequence - the mind blowing sequence.

The tetrahedral number 120.

Mathematical modeling helps understand concepts better. Three dimensional mosaic made with 120 marbles representing the tetrahedral number 120 in Pascal's table. If someone asked me to build a pyramid today, this is the way I would go. Larger the tetrahedral number the smaller the marbles and we do not have to worry about carrying huge blocks like the Egyptians did.

The pot of gold and the bird.

Time

Three gold fish

Mosaic of mirrors

Magic Squares