ETs as they could be

     Terence Dickinson (text) & Adolf Schaller (original illustrations).  Extraterrestrials (1994). An essay in controlled imagination.  Dickinson and Schaller begin with fictional ETs, then survey the Universe as we know it. Then they discuss evolutionary pressures which (probably) constrain the forms and functions of organisms. Finally, they speculate how ETs may appear if these evolutionary constraints work as expected. The book is handsome, pithy, and inspiring. Recently, SF movies have gone a step or two beyond the bug-eyed variants of human forms of Star Wars and Star Trek. I think this book and similar exercises in speculative imagining have had an good effect.
     The cover shows a half-kilometre long aerial whale swimming through the dense atmosphere of a gas giant like Jupiter. Symbiotic “crabs” living on and in the creature provide the manual dexterity needed to build cities and space-craft. ***