Karen Hill is a freelance writer, editor, and columnist.
Horizontal stripes give the illusion of widening while vertical stripes make a person taller and more compact.
But if a person wears horizontal stripes, their proportions will be accentuated sideways.
In Star Trek, some female cast members supposedly wear padding to increase their female allure.
For example lines that start off parallel, then move away from each other, and then return to parallel in a fish-eye effect give the perception of a bump on a smooth surface even if one is not present.
Our perception of the shapes of surfaces, among other things, depends on minute shadows and patterns on the surface. The reason is that we can perceive shapes only if what we see appears in different shades or colors. A similar illusion occurs with striped clothing, but it depends on whether the stripes are horizontal or vertical. See how much easier it is to notice wrinkles on a light shirt than on a dark shirt. Karen Hill is a freelance writer, editor, and columnist. They have two different sizes of padding, and the larger of the two is used when they are wearing dark clothes. If you wore white trousers the shape of your behind could be inferred from the slight shadows cast by its contour.