Dirac’s mug

A cup of tea, a hot and damp reward
For housewives who bring theses untoward
Against the sign of Dirac,  be prepared.
A cup of four dimensions, what a card
In quantum theory, light is seldom stirred
Rocked by ages, particles feel jarred
A cup of tea  with sugar, neat reward,
For all  of us who write as well as care.