Page:Landscape Painting by Birge Harrison.djvu/69

VIBRATION can readily do so by making the following experiment. Paint a sunny sky in two simple tones, using, say, delicate gray pink for the underlay and blue green or green blue for the overlay, varying the color from the horizon up as it occurs in nature. In the first experiment mix the overlay with extreme care until its value exactly matches that of the underlay. Then mix another lot to the green blue either slightly darker or slightly lighter than the underlay. Apply these tones each to one-half of the prepared sky, and you will find that the sky painted with the perfectly matched tone will fly away infinitely, will be bathed in a perfect atmosphere, while the other half of the canvas will remain merely paint and canvas, and will have no atmospheric quality whatever. The explanation of this is very simple—nature deals in broken color [41]