You perfectly time the movement of your visible hand "knocking" on your head, while your hidden hand knocks on the table. The perception of the "knocking" sound coming from your head illustrates the Gestalt principle of contiguity.

Question

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The Gestalt principle of contiguity states that elements that are close together in space or time are perceived as belonging together. In this case, the sound of the knocking on the table is perceived as coming from the head because it is close in time to the movement of the visible hand knocking on the head.

You Perfectly Time the Movement of Your Visible Hand "Knocking