Mecha Naut looks ready for a voyage of its own. Switch on this motorized nautilus sculpture and its tentacles move in a flowing rhythm while the rear propeller turns. You lean in to follow the gears, then step back to take in the whole creature. Suddenly, that perfectly sensible desk of yours has a rather interesting passenger.

Of course, you're going to want to see underneath. The alloy covering is removable, letting you trade the armoured animal for a view of its exposed machinery — and in bare metal there's no paint in the way of any of it. Build it yourself from the assembly kit or choose the pre-assembled collectible, then set it on its illuminated base. It rewards the kind of curiosity that has you turning things over and asking how they work, and this time you're meant to take the shell off.