When I did play, I would usually have a normal family thing going in the house, but there'd be one room with a fridge, one light, an oven, table, bed, tv, chair, and shower. I'd purposely leave out any doors, windows, and a toilet and then stick a guy in there to live a life of doing nothing but eating, sleeping, watching tv, pissing himself, and cleaning up the mess day after day.
And all the while the family moved freely about the house, blissfully unaware that another man lived within the walls who knew nothing of the outside world and accepted his circumstances as the only possible reality, like the people in the cave in Plato's 'The Republic'.