I told you, I’m going through an emotionally difficult time creatively

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It may seem strange to identify a sensation of temperature with the visual realm of color sensation. However, experiments have demonstrated a difference of five to seven degrees in the subjective feeling of heart or cold between a workroom painted in blue-green and one painted in red-orange. That is, in the blue-green room the occupants felt that 59° F was cold, whereas in the red-orange room they did not feel cold until the temperature fell to 52 - 54° F. Objectively, this meant blue-green slows down the circulation and red-orange stimulates it.

Similar results were obtained in an animal experiment. A racing stable was divided into two sections, the one pointed blue, the other red-orange. ln the blue section, horses soon quieted down after running, but in the red section they remained hot and restless for some time. It was found that there was no flies in the blue section, and a great many in the red section.

{ Johannes Itten, The Art of Color, 1920 }