Ghosts in the the Medieval Machine

“Emperor Constantine VII received foreign guests while seated on a throne flanked by golden lions that ‘gave a dreadful roar with open mouth and quivering tongue’ and switched their tails back and forth. Next to the throne stood a life-sized golden tree, on whose branches perched dozens of gilt birds, each singing the song of its particular species. When Liudprand performed the customary prostration before the emperor, the throne rose up to the ceiling, potentate still perched on top. At length, the emperor returned to earth in a different robe, having effected a costume change during his journey into the rafters.”

Who’s building this?

http://aeon.co/magazine/technology/medieval-technology-indistinguishable-from-magic/