Wiggleswick doesn't.

It bores him.

You must be born with machinery in your blood.
Sometimes it's uncomfortable." "To have cogwheels instead of corpuscles must be trying," said Zora flippantly.
"Very," said he.

"The great thing is to keep them clear of the heart." "What do you mean ?" she asked quickly.
"Whatever one does or tries to do, one should insist on remaining human.
It's good to be human, isn't it?
I once knew a man who was just a complicated mechanism of brain encased in a body.

His heart didn't beat; it clicked and whirred.