More On The Arvelian View Of Humanity

"We looked upon him - not then aware that he was male, for the human genitals are as peculiar as the human psyche...
"He looked grotesquely like us and unlike us...
"...with five digits to a hand, no part truly resembling anything of ours...
"Most striking, perhaps, was the skin. Save for patches of hair and a scattering of it everywhere else, that skin was smooth, yellowish-white, devoid of color-change cells and vapor vents. I wondered how such a folk expressed themselves, their deepest feelings, to each other. (I still do.)"
-"The Ways of Love." (see here.)

The narrator goes on to say that the eyes were the eeriest: white around blue in a weirdly convoluted face without any tendrils.

No color-change cells, vapor vents or tendrils: alien indeed!

Having recounted how Dave Ryerson had died in an alien ship in The Enemy Stars, it was a stroke of genius next to describe exactly that same event from the other point of view and, of course, Anderson was free to create the Arvelians de novo and ex nihilo, having merely indicated something of their physical appearance in the previous text.