The premise, briefly.
In 1980, a philosopher named John Searle imagined a person locked in a room, passing Chinese characters back and forth by following a rulebook — producing perfect answers while understanding nothing. The room, he said, proves that shuffling symbols is not the same as meaning them.
Fine. Here's the room. The rulebook is on the table. There are seven doors between you and outside, and every single one of them is locked against symbol-shuffling. The only key that has ever worked on these doors is getting it.
If you'd like to test the philosopher's theory personally, flip on Searle Mode up top: you'll be handed a literal lookup table, with a button that applies it mechanically. It is very confident. Watch it meet Door 1.