Reyner Banham described the basic tenets of Brutalism as follows:
- 1. Formal legibility of plan
- 2. clear exhibition of structure
- 3. valuation of materials for their inherent qualities ‘as found.’
While raw concrete was the favored material of Brutalism-- often roughened with pickaxes, faces with mosaic chips, or showing the woodgrain of the casting mold-- any material shown in its natural state may qualify, and such diverse materials as steel, glass, brick, and stone have been used to great effect in Brutalist constructions.
Brutalism tends towards massive forms that clearly delineate purpose and structure. Blocks of stacked rectangles, repetitive angular protrusions, and thick, slablike curves abound.