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I really don't think the intelligent life we may find would look anything similar to "Greys". It seems to me that they are an elaborate hoax made with human imagination, and I'm not just saying that for the sake of it. We are biased in the fact that we arose as sentient creatures with bipedalism, and the fact we have eyes, a mouth, a nose and ears all on our face as an adaptation from sea life. A sentient species that evolved from a long line of land-based life could be very well different. Hoaxers have to make aliens that seem familiar to us and seem to convey human emotion on their faces. If instead we encountered an "alien" more like an octopus, we would have less to relate to, and we wouldn't have a frame of reference for immediately identifying intelligence. (even though we know that octopodes are quite intelligent)
Science-fiction filmmakers encounter the same problem. Many directors and make-up artists do want to create something truly alien in their stories, but are constrained by the human audience that want to see something they can touch and relate to. Bipedal aliens in Star Trek are an excellent example of this. Filmmakers have to work on a fine line; the alien must not be too difficult to comprehend, but not too human either.
Here are a couple of examples of more extreme forms of life: Life based on the silicon atom, and life that evolved entirely in the atmosphere of a gas giant. However extremely unlikely they are, they are undeniably intriguing.
Science-fiction filmmakers encounter the same problem. Many directors and make-up artists do want to create something truly alien in their stories, but are constrained by the human audience that want to see something they can touch and relate to. Bipedal aliens in Star Trek are an excellent example of this. Filmmakers have to work on a fine line; the alien must not be too difficult to comprehend, but not too human either.
Here are a couple of examples of more extreme forms of life: Life based on the silicon atom, and life that evolved entirely in the atmosphere of a gas giant. However extremely unlikely they are, they are undeniably intriguing.