Suppose you could take a drug that would temporarily remove your tendency to see things from a human perspective. While you were under the influence, you would perceive everything without any human bias.
Other people would just look like the strange fleshy things they are, with odd protuberances waving about. Faces would not have any particular significance.
You would probably notice that in human-made environments, nearly all surfaces are at right angles to each other, in an extremely unnatural and stylized way.
I’m not sure what other things you would observe, because it’s hard to take off my own mental “human goggles”.
Now here’s another question: After coming back from such an experience, would you have a new perspective on the world around you, and the people in it?