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Carlito’s Contraptions has a great, and simple, keychain project that anyone can finish in just a few minutes. It is so simple that it requires only 2 steps to complete, and step 2 is to “admire your creation”. It would be hard to find a more elegant solution to a common problem of bulky and noisy keys in your pocket. – Link

Related:
Calito’s “La Cucaracha” BEAM robot – Link