Penisknee is a photographic optical illusion wherein a photograph's subject appears to have a penis that extends the length of the thigh to the knee. It is a result of a combination of shadows and the contours of the subject's clothing. Penisknee is rare and when properly seen the viewer can experience a Gestalt Switch between perceiving the illusion of the penis and the knee that is actually being viewed.
The light and shadows on your knee are causing penisknee.
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