You show an opaque metal sheet in the shape of a blinfold and put it over somebody’s eyes. The spectator cannot see anything through it. You then show a black bag and put it over the spectators head. He can see only darkness through it, not even a single ray of light. You then wear the metal blindfold over your eyes and the black bag over your head. Blind folded in this way, you can drive a car, a bike or cycle through the busiest street of the town.