Still going strong with my concept of using the functional aspect of a nictitating membrane as the driving force to my design. In this case, a visual protection - privacy - from others while changing on a beach. In addition to this, a new part of the eye has been examined: the iris. This part of the human eye controls the light allowed to reach the retina. A mechanical iris (diaphragm) is often used in photography (as the aperture or sometimes the shutter) to let in certain amounts of light. In my design the same principle will be applied on the 'ceiling' of each changing stall. Opening and closing the door/'membrane' also opens and closes the ceiling/'iris'. A person is protected from the view of others but has light in order to change clothes.
Iris Mechanism I quickly modeled... just kidding.