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Experience
Press left or right as randomly as you can. Before every press, I've already made my guess.
Your presses stay on this phone. Nothing is saved or sent.
It's a small experiment about randomness. You press left or right with no pattern at all, and before each press the Oracle guesses which one it will be. If you really are random, it can only get about half. The more it gets right, the more of a pattern there is in how you press.
The idea comes from a simple program described by computer scientist Scott Aaronson: remember your last five presses, look at what you pressed next the previous times you made those same five, and bet on that. It knows no psychology and nothing about you. It just counts.
Based on the "oracle" program described by computer scientist Scott Aaronson.
In 1972, psychologist Willem Wagenaar reviewed studies in Psychological Bulletin that asked people to write or call out "random" sequences, and concluded that people find it very hard. Trying to be random, we tend to switch too often and avoid long streaks, as if every press had to balance out the last one.
That isn't a flaw. The mind is always looking for patterns and building routines, so everyday life takes as little effort as possible. The same machinery is why habits are hard to change once they form: it isn't a lack of willpower, it's a mind that is very good at repeating the paths it knows.
No. Each guess is written down before you press and dealt face down in the middle of the screen. The card only turns over once you press. The Oracle guesses from the presses you've already made, and never knows which side you're about to choose.