A triptych is a painting made in three sections that fit together. It can also be three relief carved panels.
Dadaism
James Q. Wilson
He is a Pop artist.
It is post-impressionist.
Analysis.
Analysis.
He was his own style all of his life.
Most of his artwork is abstract (non-representational) and has no recognisable subject.
The Merode Altarpiece by Robert Camping is an outstanding triptych of Northern Renaissance style. The figures in this triptych are based on real world observation, as opposed to science and math that were used to create paintings in the Italian Renaissance.
Early Italian Renaissance.
True, blitzkreig style of fighting was first introduced in World War 2.