Hiking Mount Whitney 2023
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ponchos
/L/ Angles and Environment 
/1/ angles: horizontal; overhead and intermediate = 45 degrees. It remains to be shown that angles like 30 and 60 degrees would be significantly different than 45, but for camouflage?
/2/ time of day: morning; full daylight; afternoon; civil dawn; nautical dawn; astronomical dawn, civil dusk; nautical dusk; astronomical dusk and darkness.
/3/ the spectrum of sunniness versus overcast
/4/ the spectrum of moonlight from new (none) to full
/5/ variations in latitude - equatorial to polar. It remains to be shown that there is much difference in north versus south so just one hemisphere
/6/ perhaps four or more seasons
/7/ dominant backgrounds like snow, lake, dynamic river, swamp exposing lots of water
/8/ wind on prairie grass, desert, alpine ...
/9/ floodwater - whether from a tsunami, hurricane or riverine overflow - is different enough to warrant inclusion
/10/ whether the subject is still (unconscious, dead , hiding, sleeping ...) or moving