Pin art boards allow users to press objects or parts of the body on one end and see a depth image of it emerge on the other side, and the computer game Portal allows players to seamlessly move objects or themselves between a pair of wormholes. Put these interactive concepts together, and you can create the illusion of a real working pair of portals, albeit with a pin art board halfway through them. On one end is a pin art board halfway submerged through one "portal" with push potentiometers behind each pin. On the other end is the "other half" of that pin art board, with linear actuators behind each pin to mirror the extent to which the corresponding pin on the other end is pushed out. This gives the illusion that it is the same pin art board, and that the portals are working just the way they do in the iconic computer game.
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