Maybe there is a single spot, just one, where living organisms are holed up. Maybe so, but if so this would be the strangest thing of all, absolutely incomprehensible. For we are not familiar with this kind of living. We do not have solitary, isolated creatures. It is beyond our imagination to conceive of a single form of life that exists alone and independent, unattached to other forms.

"The Youngest and Brightest Thing Around" (p. 13) - The Medusa and the Snail: More Notes of a Biology Watcher (1979)