It's part of the art. Thats like asking why kinetic sculptures move. The whole generating energy from your own inner heat part is kind if part of it. It's not s

It's part of the art. Thats like asking why kinetic sculptures move. The whole generating energy from your own inner heat part is kind if part of it. It's not supposed to make enough current to charge your phone, it's art. You're way overthinking it.