"Doubly happy, however, is the man whom lofty mountain tops are within reach,
for the lights that shine there illumine all that lies below." -- John Muir
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Please adjust the contrast and brightness on your monitor so you can see all
twelve blocks of color distinctly. Your monitor is too bright if you cannot
just barely differentiate 11 and 12. Your monitor is too dark if you
cannot differentiate 1 and 2.