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Visual Display of Quantitative Information
Envisioning Information
Visual Explanations
Beautiful Evidence
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Visual and Statistical Thinking $2
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Data Analysis for Politics and Policy $2
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Presenting Data and Information
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Edge Fluting

I am unclear about exactly what edge fluting is as referenced on page 92 of Envisioning Information. I have done a dictionary look up and Internet search. I see lots of references to architecture, etc. I understand that it has to do with contextual effects, but feel like I am missing something.

-- Mark McMillion (email)

Steve Sprague's answer is exactly on point. To learn more about edge fluting, see Josef Albers, Interaction of Color.

In the value scale at the top of page 92 of Envisioning Information, note that each rectangle is the same uniform color throughout (confirm by covering the adjacent rectangles), and the apparent color shift in a given rectangle is induced by the adjacent rectangles. There's more in Albers.

-- Edward Tufte

In the computer graphics field, this phenomenon is also known as 'mach banding'. It is most noticeable (to my eyes) where there is the added dimension of hue-shift as opposed to just value shift. See the java demonstration below:

-- John Balestrieri (email)

John's Balestrieri's suggestions are superb; everyone look at the links mentioned. Interactive experiments in edge fluting (or Mach banding) are presented.

-- Edward Tufte

There is a very good article on the perception of colour along with effects such as mach bands in the May-June 2002 issue of American Scientist. The link is :

-- Andrew Nicholls (email)

Threads relevant to magic and illusions:

Threads relevant to nature studies:
Theoretical speculations on leaving the flatland of paper and computer screens and working now in real-land and space-land.