
Human senses 59
Figure 3.8 Do you see 4 roses of same size more or less separated or 4 roses on the same plane?
Figure 3.9 Do you see an ellipse in front of a rectangle or an ellipse at the same distance as the
rectangle cut at one side?
4 Gradient of the texture of a surface:
The texture of a surface is perceived clearly if the surface is placed at a slight distance.
This gradient of the texture gives additional information about depth.
5 Variation of visibility in an outdoor scene:
The visibility of an outdoor scene decreases with the thickness of the atmospheric layer,
and hence the depth (Figure 3.10).
6 Parallax caused by movements:
When an observer ...