This is an interesting mental magic that is absolutely easy to do. The mentalist places a black disc on the table stating that it a prediction. Now a plastic board is brought forward that has numbers from 1 to 4. Any number is selected by a spectator (no force). The board is turned over to show four colored spots. The color that falls on the selected number is noted. The disc is turned over to show that it has the same colored spot on the reverse!