Monocular Cues to Depth

Two objects are along the same line of sight, such that the nearer one will occlude part of the remote one form view

The overestimation of its distance form the observer causes the images apparent size to be increased

If the field of view is flat, the bases of more distant objects are higher in the visual field than those of the closer ones

If a straight line is tilted away from the viewer, its length in the picture or drawing is shorter than it would be if the line were perpendicular to the line of sight

As an object is moved away from an observer it subtends a smaller and smaller angle at the eye such that its retinal image size decreases in direct proportion to its distance

The nearer portion of the railings are well separated, but farther away they become closer together (a point artists call the vanishing point)

Related to linear perspective as with distance there is a decrease in detail and a crowding of picture elements

Based on the fact that outdoor objects that are farther away appear less clear than those that are nearby and the colour of distant objects is less saturated (both brightness and colour are reducer)
- due to atmospheric scatter that is greater the longer the path of light
- nature of selective absorption and scattering is a function of the type, size and number of scattering particles, as well as the angle of scattering, which is dependent on the location of the sun in the sky

Form of scatter, where the size of the scattering particles is larger than the wavelength of light

Light at the short-wavelength end of the spectrum is most affected
- dark objects in the distance appear bluish, and bright objects appear pinkish

Shading lends a 3D texture to objects

Relative motion of two or more points that accompanies lateral displacement