Most visitors would pass the frame of Matthew Perks’ new invisible PC without a second glance. A mountain valley fills the canvas, river through the center, pines and rock along the banks, a small steam engine lost in the mist. Real paintings hang on either side, and the arrangement reads as ordinary wall art. A pull on the top edge breaks a pair of magnets. Piano hinges carry the panel down until Dyneema cord, running through a small roller, stops the swing at a right angle and keeps the line clear of the work surface once the panel is shut again. A finished desk is now in front of you.