[Lonna]

What is it called when an object in a painting seems to move as you walk past it? Is it vanishing point perspective? Lonna

[Clough]

Do you mean like eyes following you in the painting of a portrait?

The following is from Vanishing point - Wikipedia, the free encyclopedia

For other uses, see Vanishing point (disambiguation).

A vanishing point is a point in a perspective drawing to which parallel lines appear to converge. The number and placement of the vanishing points determines which perspective technique is being used.

Linear perspective is drawing with 1-3 vanishing points.
Curvilinear perspective is drawing with 5 vanishing points mapped into a circle with 4 VPs at the cardinal headings N,W,S,E and one at the circle origin.
Reverse perspective is drawing with vanishing points that are placed outside the painting with the illusion that they are "in front of" the painting.
Vanishing points were first used by Renaissance artists such as Donatello and Masaccio.

Vanishing points can also refer to the point in the distance where the two verges of a road appear to converge. This is often used to help assess the upcoming curves in the road; to judge the radius and therefore the entry speed and optimum line. If the vanishing point moves towards you or to your sides, the curve is tightening. If the vanishing point moves away from you or comes to centre, the curve is straightening.