Sentence:  In similar spirit, Nigel Henderson, a member of the Independent Group's Brutalist core, exhibited black and white photographs of the East End at the 1953 ICA show "Parallel of Life and Art" which stressed the unsanitised reality of everyday life: Peter Smithson's defence of <WSD>Brutalism</WSD> through the categorical rhetoric of objectivity and truth, quoted above, echoes Anderson. 
Meaning of the word marked with <WSD> tags:  A style of modernist architecture characterized by angular geometry and overt signs of the construction process.