Memory of Fields

Is memory nearly always a positive element?


Phil Spector has wished in an interview "good health, bad memory".


Anyway.


Memory of electric field.
Examples:
Electret.
A charged capacitor.


Memory of magnetic field.
Magnets.
Inductors. Trying to keep current through them constant.


Is there memory of electromagnetic field?


Of gravitational field?


Of deformation of space time?


Of springs?


Of elastomers?


Of mass!
Statues are examples.