Plumb-bob

Quantum computer? someone said.
Another replied with fear in her eyes:
What About the bad guys in disguise?
A knot! A knot! in a spherical mirror.
The answer back did cry:
Where? When? How? And why?
Someone replied that’s not my job;
I’m only working with a plumb-bob.
An initial spark in a room full of dark.
One idea shared: creators to embark.