Pull the right book and the shelf slides open. Behind the flat is a laboratory, four machines full of giant bricks, and a tunnel network that runs hundreds of metres out to playrooms the size of warehouses.
Press a button and a machine drops a brick into your hands. Bricks snap to each other the moment you let go and stay exactly where you put them, so a wall you spend ten minutes on is still standing when you come back to it.
Red, green, blue and yellow, in the laboratory and in every playroom. Take as many as you like.
A bookshelf in an ordinary living room that is not a bookshelf. Press the red button beside it and see.
Walk up to a pod and it seats you. Squeeze the trigger — the harder you squeeze, the faster it goes.
Each one a different colour and a different size, with a jetpack on a stand by the door.
A house assistant who tells you what a thing does the first time you walk up to it, and then leaves you alone.
Snap turning, a seated and locked pod ride, and the view goes black the moment the system menu opens.