Two people play Tetris side by side, connected by a stretchy cord at the inside ankles
The device consists of two bands, attached the ankles, with a stretchy cord measuring how much each partner is pulling. If the left partner is pulling, then the current Tetrimino will move to the left, depending on the tension, and the same goes for the right partner. If both partners are pulling, however, the piece will move down faster, and when the two move close together, the piece can rotate. So the two will need to work together to place their pieces as best as possible.
Some of our inspirations were a pair of connected hoodies, described here, a massage vest (two person interaction), detailed here and here, and another, scrapped idea: elbow bands, inspired themselves off exoskeletons and blood pressure arm cuffs.
We tested the general idea with a lightweight, stretchy sweater, during which we came up with the ankle rotation sensor to solve the force isolation problem; the stretchy cord really only measures tension from two people. It also confirmed the necessity of sturdy, yet removable bands. (I just tied the sweater on, which works fine on jeans, but not on a bare ankle. Kept coming off mine.)
The issue of safety also came up; what if someone pulled too hard on the cord, knocking their partner over? Or when the two move close together, they'd have to be careful not to trip over the connector. We figured we'd handle that through instruction, although if we can come up with a better idea, that would be great.
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