Treat space as structure, not leftover

Why this rule exists

Beginning designers see whitespace as the absence of design, the empty parts left after the real elements are placed, and so they fill it, cram it, apologize for it. Experienced designers know that space is one of the most powerful tools they have, because it groups, separates, and ranks without adding a single mark. The distance between two things tells the eye whether they belong together; a tight cluster reads as one unit, a wide gap as a boundary. Space is how a design breathes, and cramped interfaces feel stressful for reasons users cannot articulate but always feel. Empty space is not wasted space; it is doing quiet, structural work, defining relationships and giving the important things room to be seen. The confidence to leave a region empty is one of the surest signs of a designer who trusts their hierarchy.