Top definition
The theory that which all clouds can look like any object the viewer wants to see, due to all of the random ridges and displacements throughout them.
Person A. "Look johnny! That cloud looks like a sand castle!"
Person B. "No it doesn't! It looks like a tree!"

Person A. "Whatever, that's just The Theory of Cloudtivity"
by Tyler The Philosopher December 03, 2009
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