Show 2 black containers with red lids and a dice. Have a spectator take the dice and choose a number. They place it face up inside of the container and the lid is placed on it. This way there is no way the magician can see which number has been chosen. The magician then places it in a second box and puts the lid on. This guarantees the dice is fully concealed within. Even though the dice is contained within the boxes you will always know which number it is. The trick can be repeated. Easy to perform. Takes only a few minutes to learn. Small to carry with you. Any number can be chosen randomly each time. Looks like you’re reading the mind of the audience.
Container color varies between blue and black.