A slipper. (Made this up today, but almost definitely will have been made up before by someone else)
A pair of slipper
On the left side there's nothing right and on the right side there's nothing left...
Clawing at the inside of her coffin.
They look at YOUR shoes when they talk to you.
When talking to you, the extrovert mathematician looks at *your* shoes.
It's all in the grip.