Your eyes are trained to look for a silhouette of a person. By breaking up the silhouette, your eyes might look over it. In the old days they used to train soldiers to look the opposite way they read, so as to be forced to study what they are looking at. So if you read left to right, scan your area right to left.
Others have detailed a lot the specific answers. I would like to add a more general note.
Most people think camouflage is “something that makes you invisible” in the same way a disguise is specifically something that makes you look like some other person.
This is not the case. Camouflage and for that matter, any sort of colour and patterning has the main goal of disrupting the ability to clearly understand what is being seen. Some camouflage can be extremely visible and also very effective because an observer knows they saw something, but not exactly what did they see. And what you can’t communicate, doesn’t exist.
Examples in nature are zebras. They are clearly very visible but it’s almost impossible to get a good count or even a general idea of what is going on in a group of moving zebras.
Many cetaceans do this too: They are dark up top and very clear at the belly. This makes them hard to recognize if seen from above (dark against dark water) or below ( clear against clear water.
Human eyes are extremely good at seeing human shaped objects. So much so, we often startle ourselves mistaking things almost human shaped. The purpose of camouflage of any kind is to break up outlines into patterns that remain unrecognizable. It’s to stop someone from seeing you without looking for you.
Note that you’re not supposed to be invisible in front of a nice clean office building with glass walls and a park bench next to it. You’re supposed to be hard to see from a distance among rubble. There’d be a lot of dust and concrete debris in an urban battlefield. That’s where the urban camo comes into play.
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