Erich Heckel is strongly light-biased - shadow is suggested rather than declared. Erich Heckel builds on cool foundations: the palette favours the blue-cyan-green arc. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. The highest-chroma note - #9FA954 - appears at just 5.2%, deployed as a precision accent against the quieter ground. At 63 units of value range, the palette has the tonal breadth to sustain complex spatial readings. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. In the context of Erich Heckel's full range of palettes, group 1 represents one movement in an ongoing chromatic dialogue.