Colours on the painter's palette evoke a double effect: a purely-physical effect on the eye which is charmed by the beauty of colours, similar to the joyful impression when we eat a delicacy. This effect can be much deeper, however, causing a vibration of the soul or an "inner resonance"—a spiritual effect in which the colour touches the soul itself.
Color Study: Square with Concentric Circles, Wassily Kandinsky, ca. 1913
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A joyful impression!