You wore swimming trunks. Now you do not feel them on you; the slight pressure of the elastic waistband is no longer there against your waist. You touch your hands to your hips. You are naked. And standing.
Whatever has happened to you is more than a change to sudden darkness or to sudden blindness.
You raise your hands gropingly before you. They touch a plain smooth surface, a wall. You spread them apart and each hand reaches a corner. You pivot slowly. A second wall, then a third, then a door. You are in a closet about four feet square.
Your hand finds the knob of the door. It turns and you push the door open.
There is light now. The door has opened to a lighted room ... a room that you have never seen before.