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Perspective and Illusion

26 27 lIghT on Form tonal illusions of the thirddimensional kind We glean information about the form of objects not only from the shadows that they cast below, but also through the subtle shades that appear on their surfaces. All materials, whether glass, wood, metal or plastic, have different reflective properties and opacities which we instinctively read. The merest hint of graded shades gives the eyes subtle clues as to the form, depth and substance of an object, and, with the addition of reflections, can also indicate the positions of other light sources and nearby objects. In the Victorian engineering engravings opposite, a simple outline has been given threedimensionality by the use of shade, here as a textured tone. Tones may be scale illusory, as in fine cross hatches the engravers preference or printers halftones newspaper dots, or actual shades in paintings or computer screens. Luminosity is a factor in colour as is hue, and when two colours, say red and green, are equiluminescent they appear the same gray in a black white photograph. Artists sometimes use this to place wrong colours of the right luminosity in paintings, to confuse your colour blind what system while engaging your where system.
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