video only.

A Tiandi Coin is inspired by the complexity- and simplicity- of gear mechanics.

This coin has thin, low profile "teeth" that are not sharp, but gently grip into other Tiandi Coins because they all share the same pattern on both the front and back side of each coin.

This gear pattern repeats four times on each coin face, so that a 90 degree turn of a coin will lock it into place with another coin. Locking the coins into place is a very satisfying twisting motion that can be repeated over and over again as the coins separate just as easily as they join.

A unique aspect to this coin's fidgeting ability, is that it encourages bilateral movement as both hands are involved in the locking of a Tiandi Coin Set - not only is it fun and satisfying, but research suggests this style of movement can be good for mental health!