Cause of shadows.
So then back to the question "why "
Then PE is on to something
perhaps a YUPPY advertising gimmick
Like Ergonomic .... Ergonomic ? designed to minimize physical effort and discomfort, and hence maximize efficiency
So one is digging in the snow with his Ergonomic white shovel .... sets it down a moment { union rules " break" }
"DUDE ?" where my shovel ? ... only the Shadow knows ....