When a cube is tilted upward in such a way that the spectator is seeing it from beneath, it is above the horizon or height of the eye. If more of one side of the cube is seen than the other, the broader side will be less in perspective than the narrower side. The narrowest side of a cube presents the more acute angle and will have its vanishing point nearest.
When an object is above eye level, the lines of perspective are coming down to the level of the eye and the vanishing points will be near or far apart according to the angles. The nearer the object the nearer together are the vanishing points.
When a head is to be drawn in profile it is well to first determine whether the head is above or below eye level. This can be done by holding a pencil or rule at arm's length at a right angle to the face from the base of the ear. If the base of the nose shows below the ruler, then you are looking up underneath the head; therefore the head is above eye level or tilted backward. If the head is three-quarters view or front, the line from ear to ear will cut below the nose as in profile when seen from beneath.
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