Question

The environment changes from second to second, from moment to moment. nevertheless, we see the world as having stable properties. this is known as perceptual _____________

Answer 1

It is is known as perceptual constancy. In perceptual constancy you are not able to notice changes in an objects shape, size or direction. In other words, even though an objecting is changing it always looks the same to you even when change is actually occurring because you have gotten so use to your perceived appearance.