Effect : You (the magician) hand a spectator a sponge block.
When the spectator throws it on the table, it becomes two sponge blocks in two different colors.
The process is repeated and they become three blocks in three colors.
Finally, the three blocks are placed in the spectator’s hand and become “cemented” into one large tri-colored block.
Comes complete with all the required Sponge Blocks, and instructions for use.