Maymay Wong

The eye is sensitive, along the Z dimension, to 6 independent visual variables, which can be superimposed on the planar figures: the size of the marks, their value, texture, color, orientation, and shape. They can represent differences (≠), similarities (≡), a quantified order (Q), or a nonquantified order (O), and can express groups, hierarchies, or vertical movements.

… numbers ⟨x, y, z⟩. Yet with abstract data there are also non-quantitative dimensions; for example, diamond cut quality (fair, good, very good, ideal) is ordinal, while diamond cut shape (princess, round, marquise, etc.) is categorical.

…ng data visualization elements (like an axis) in the DOM from your data and methods. It’s useful to separate the graphical functionality of D3 into generators, components and layouts. Since layouts and generators don’t produce DOM elements but only raw material for creating DOM elem…