NASA's robot explorer Spirit, described in Chapter 5, faces the challenge of navigating unfamiliar terrain and photographing what it sees. For an update on Spirit's activities, check out this NASA website.

At this webpage you can try your hand manipulating the sizes of the "blocks" used in the "block masking" procedure illustrated in Figure 5.25, page 174.

Fourier Analysis is discussed in Chapter 5 (Spatial vision) and in Chapter 10 (hearing). For web resources and demonstrations about Fourier analysis go here. For a more detailed, but still accessible treatment of Fourier analysis, get Larry Thibos' webbook.

When it comes to understanding spatial vision nothing beats seeing your own contrast sensitivity function, and you can do this by viewing the test figure available here.

Gestalt principles can be applied to commercial visual design, including web pages. To see how, go here or here.