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I'm looking forward to printing one of these at some point as a representation of an item for a tabletop RPG.

Perhaps it's a dwarven-crafted key for a complex mechanical door? "When you place the box in the hole in the door, it begins glowing and rotating, turning the gears to open the vault door."

Or perhaps it's the heart of an ancient airship, and placing it in the engine compartment brings the ship back to life?

Maybe it's an item of great power that has served similar roles over the years... but is currently the toy of a nobleman's infant, ignorant of the great power it contains. The party's wizard almost screams because the magic aura is overwhelming and THE NOBLE GAVE IT TO HIS KID AS A TOY. "ARE YOU TRYING TO CAUSE AN APOCALYPSE???!?!?!"