The cake can be easily compressed to be produced from a Magic Pan, a Square Circle or other production prop. 
Great comedy effect!

This colorful soft foam sponge cake automatically pops up into a birthday cake that measures about 10 inches tall from the bottom of the cake to the tip of the candle.
It is about 5 inches in diameter at the base. 
The three cake layers (not including the candle) measure about 7.5 inches tall.
The layers do not come apart- the whole cake is attached as one piece.
Decorated as shown.

No instructions needed- just hide it and produce it!