If you have good control over your own body language then you have no need for a blind. Most animals don't flee at seeing a man shape, it's the activities, the body language, of that shape that decides for them. If you amble around like a harmless herbivore most animals will simply ignore you.
Conversely, if you're sneaking around and hiding behind bushes and blinds then you are seen as stalking or hunting, predatory behaviour. This is why very small children are able to approach animals when most adults are not, animals see no guile in the behaviour of a small child.
Some animals are camera shy though, Crows especially. Point a camera at a crow and it reacts as if you're pointing a gun, I think the lens looks like a big scary eye to them.
This photo is not from today:
