Here is a quote from Carl Jung on why people create "stone idols with human features":
“Very early in history men began trying to express what they felt to be the soul or spirit of a rock by working it into a recognizable form. In many cases, the form was a more or less definite approximation to the human figure – for instance, the ancient menhirs with their crude outlines of faces, or the hermae that developed out of boundary stones in ancient Greece, or the many primitive stone idols with human features. The animation of stone must be explained as the projection of a more or less distinct content of the unconscious into the stone .” Carl Jung in "Man and his Symbols"
It's my opinion that whatever thoughts and feelings were present in the collective unconscious of the members of the community that erected these monoliths are unknown to us modern people. But the aesthetic beauty of the statues of the Greco-Roman era we can relate to and appreciate. I don't think that the same can be asserted about these Easter Island monoliths and of the people that created them. The expression of the black man in the background mural, who appears to be gazing at and reacting to the presence of this monolith, seems to be conveying my assertion or observation. As a point of interest, the mural on that wall was painted on AFTER the Easter Island monolith was installed in this vacant lot.