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Uneven light from a window.
Uneven light from a window.
The same light, redistributed by prism tiles in the window.
The same light, redistributed by prism tiles in the window.
Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Cru
Threshold increment versus background luminance for various target diameters (in arcmin). Data from tables 4 and 8 of Blackwell (1946), plotted in Crumey (2014).
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Gustav Fechner
Gustav Fechner