By design, most prostheses aren’t fun—they’re built to fill a utilitarian need. And while that’s fine for adults, who need to work, it can be tough on kids, who want to play along with their friends. Enter Iko, a prosthetic arm built by Carlos Arturo Torres to enable children to replace a lost limb with one that could have come from Inspector Gadget. When they need a hand, they have one. But they can replace it with any number of toy-like attachments, all of which are compatible with Lego products. (Torres developed the device while working at Lego’s experimental Future Lab in Denmark.) Torres is still finalizing distribution details, but his larger hope is that Iko will destigmatize disability—like it did for 8-year-old Dario, an early tester. Before the test, one of Dario’s friends told Torres he felt sorry for Dario, because there were things he couldn’t do. That changed after the friend watched Dario use Iko. “I want one too,” he said.