From the Super Mario Wiki
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As their name suggests, Pot Cannons are pot-like cannons. They also have eyes that seem to serve only for decorative purposes.
Mario can enter a Pot Cannon just as he would a Warp Pipe (by jumping onto it and pressing "Down"). After Mario is loaded in the Pot Cannon, it will start moving in three directions (forward, backward, and upward), clicking as it moves. By jumping while inside the Pot Cannon, Mario can launch himself forward (and, if he times his jump perfectly with the click, he can blast himself super-far).
Pot Cannons are primarily used in Land's End.
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