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Typical stimuli in the lighting direction–discrimination experiment illuminated from slant 60° and tilt 20° (i.e., lighting above and to the right). The stimuli show the five diffuseness levels used in the experiment, namely ICE values of (a) 0.2, (b) 0.4, (c) 0.6, (d) 0.8, and (e) 1.0.
