Learn in the textbookBasic Principles of Design and Organizing Information
DefinitionContrast (対比) is the principle of making clear differences in size, weight or color so that important elements stand out and the priority of information is shown.
ExplanationSet headings larger and bolder than body text, and readers see at a glance where to start. If the difference is too small, nobody can tell intended emphasis from a simple mismatch, and the effect fades.
AnalogyAn unusually bright star in the night sky catches your eye at once, but when every star shines equally, you do not know where to look.
Memory hookThink of contrast in a photo: the bigger the gap between light and dark, the more it grabs attention.