For many years now we have been putting sillouette hunters in our ladder and tripod stands even sporting an orange cap. Does to things.
1. Deer get used to it and begin to loose fear of it being there alowing you to slip in its place and see less spooky deer. We have actually placed a small rag with human sweat on it so they can also get used to a little human scent.
2. Other hunters that shouldn't be in the area wander up and see it and immediately retreat back into the woods thinking they might get seen. Keeps trespassers down and hunters out of your honey hole.
Every little bit helps.
Just a little DeerDope on the subject.