"Iyo ndiko nkora ubushakashatsi budashingiye ku bintu biboneka, mba nsa nk'aho ndiko nditembereza mw'ishamba ry'ibintu bitagaragarira amaso, nshakashaka uburyo bwo kubivuga no kubishingira amahame, ku buryo nshobora gutunganya neza ivyiyumviro vyanje nkabishira ku murongo, gutyo ngashobora kubisobanura." Cheng akora mu gisata bita 'Theorie des categories' (ni amahame akoreshwa mu gusobanura ikoreshwa ry'ibiharuro mu biharuro nyene) gikunze gukoreshwa mu kuroranisha ibisata bitandukanye vy'ibiharuro.
