Nick’s lack of depth perception while wearing sunglasses made him realize too late that the photographer was too far back for a waist-and-above shot, thereby exposing not only that he was sitting on a fence, but also that his legs failed to reach the ground. 

Nick’s lack of depth perception while wearing sunglasses made him realize too late that the photographer was too far back for a waist-and-above shot, thereby exposing not only that he was sitting on a fence, but also that his legs failed to reach the ground.