Any of you who live in the country or have a view out your door or window where you can see critters from time to time, you'll know what I'm talking about here. Same goes for your favorite stand. You've spent hours in it over the years and you know every thing in its place throughout your view. If you see something different, moving or not, it catches your attention and you check closer.
I have a view to the woods behind my house that is 92 yards away and then an open, private gravel lane that goes through a wooded area about 300 yards. I scan this area everytime I go by a door or window. My wife thinks I'm nuts. I've seen the usual, deer, fox, cats, coyote (yotes buy the farm when I see them),turkey etc. After keeping an eye on my "home range" these past four years I can spot something out of place pretty quickly. It could be a branch fallen off a tree, a piece of litter, windblown debris, and of course a critter. What I spot is nearly always a "shape" not a color out of place. I think deer get to know the view in their home range quite well also. Throw up a pop-up blind, cut shooting lane, create a hole in a cedar tree for your stand, or a person standing motionless in the open, and they get antsy.
I was caught by a doe at 12 yards this year from a ladder stand I was in. I was seated, and scooted 6-10" away from the tree trunk to get my shot, but I was very still. I think she noticed my silouette was out of place. She didn't go nuts but she moved stiff-legged from the area. I don't think any manner of covering would have saved the day. I should have stayed closer to that tree trunk.
I like new and different camo patterns. I've bought some of the Mountain camo, sagebrush, various Real Tree, Predator, Sika, etc. I know the pattern isn't as important from a stealth perspective as the material, fit, and placement of pockets, snaps, etc. However, over 45 years this has become my bowhunting uniform and I feel more confident when I'm wearing this stuff. I've also bought a few fishing lures that have never caught anything but me.