1842 E. A. Poe in Jan. 68/2 With the increase of the thinking-material comes the desire..of abandoning particulars for masses.
1971 B. de Ferranti ix. 80 The amount of ‘thinking material’ in the brains of a number of fishes was doubled by transplantation from other fishes.
2004 (Nexis) 22 Nov. 10 Much of the exhibition is quite tough and certainly art as thinking material.