When classical physics says "build a wall to keep things out," quantum mechanics says "hold my wave function." The comic brilliantly illustrates quantum tunneling - that mind-bending phenomenon where particles can magically pass through barriers they technically shouldn't have enough energy to cross.
In the quantum world, those arrows (representing particles) don't care about your silly wall! Despite having energy less than the potential barrier (E<V), there's a non-zero probability they'll appear on the other side anyway. It's like nature's way of saying "your security system has a fundamental loophole at the subatomic level."
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