There are as many types of questions as components in the information. - Jacques Bertin

The use of computers shouldn’t ignore the objectives of graphics, that are:

The plane is the mainstay of all graphic representation. It is so familiar that its properties seem self-evident, but the most familiar things are often the most poorly understood. The plane is homogeneous and has two dimensions. The visual consequences of these properties must be fully explored.

[Bertin's 'color' refers to] the repertoire of colored sensations which can be produced at equal value.