Since cannot be reduced further, it is called a "normal form".

One might call this mixed bag a form of cottage gardening.

He calls the progressive income tax a form of slavery.

It is not what you would call a "low-risk" form of transportation.

He is comfortable with calling his work a form of arranging.

Being subject to collateral consequences has been called a form of civil death.

You might call it a subtle form of political patronage.

You might call it a creative and aggressive form of marketing.

They recently decided to call rape a form of torture, which places it among the most serious war crimes.

This problem has grown to such an extent that it can be called a new form of slavery.