A structural chameleon: A porous layered carbon material (PLC) containing nanographene domains was prepared by graphitizing glucose within the nanoscopic voids of an aminoclay template. The size of the pores in the PLC was altered reversibly by a mesoscale order-disorder transformation brought about by an applied mechanical force (see picture). This pore flexibility was exploited for the size-selective separation of dye molecules. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.