"Well—" there was some hesitation. "Considering the method of locomotion, bisymmetry seems more justified there. However, why bilateral? Why not quadrilateral?"
"Because the organs of sight face only one way."
"I can fix that, too."
My spine buzzed, and when I looked down again a flood of peculiar changes had taken place. My ankles terminated in the middle of my feet, and my heels had disappeared. In their place were toes.
"You see, with the double-hinged knee-joint, he can travel forward or backward now without pivoting...."
Then I became aware that I could look forward and backward at the same time.
"That thing in the middle is certainly superfluous."
"Yes."
Buzz!
It was gone.