Part of building installations is finding a way to make everything look clean. We're not trying to hide anything here, but I do want to avoid messy wiring. So all the heads have a small board attached which is static, and takes power in. This means that the robotic stuff is completely self contained, and can be taken off the base easily.
A side effect of this is that we can put some LEDs on the power board, and light up the base, to give them another option for communication: