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Keywords from Image Description:
Grassman color circle . en Hermann Grassman's color circle illustration of Grassman's law of color combination google id PUifpzKWhLkC printsec frontcover dq grassman ssecondlawcolorlinear asbrr ei HQgSqDGLpDOlQTmpWBQ Hermann Gnther Grassmann Hermann Grassmann Gert Schubring PDold Colorimetry Colorwheels