an art teacher demonstrates color blending by slowly mixing paint on a large palette. She carefully adds small amounts of blue paint to white, creating increasingly darker shades. The palette shows distinct sections progressing from pure white to light blue to medium blue to deep navy. Each stroke of her brush creates the next shade in the sequence, building the progression step by step. Students gather around watching intently as each new color emerges from the previous one. Other palettes on nearby tables show similar color progressions in various stages. a gradual change from one thing to another through visible steps