The three primary straight lines carry distinct inner temperatures: horizontal (cold), vertical (warm), diagonal (balanced)

Kandinsky identifies three typical straight lines of which all others are variations: (1) the horizontal — corresponding to the plane on which the human stands; its basic sounds are coldness and flatness, the most concise form of endless cold movement; (2) the vertical — at right angles, height supplanting flatness, warmth supplanting cold; the most concise form of endless warm movement; (3) the diagonal — diverging from both at equal angles, its inner sound is an equal union of coldness and warmth, the most tensioned of the three. This warm/cold vocabulary is not metaphor but a structural claim: the inner ‘temperature’ of a line determines how it interacts with other elements and with the basic plane’s own tensions. Black and white are analogous to horizontal and vertical — silent, colourless extremes.

Examples

A horizontal gradient (dark to light, left to right) feels cold and stable. A vertical composition (tower, column) feels warmer, more active, potentially climbing. A strong diagonal introduces maximum tension — it always carries both warmth and cold simultaneously. In Hydra: osc().rotate(0) = cold horizontal; .rotate(Math.PI/2) = warm vertical; .rotate(Math.PI/4) = balanced diagonal.

Assessment

Design three distinct Hydra or p5.js frames using only straight lines: one dominated by horizontal (cold), one by vertical (warm), one by diagonal (tense). Without labels, have a viewer identify which is which and explain what cues they used.