The Princeton MRSEC iSuperSeed focuses on the topics of polymeric materials driving structure and biological function at (i) the intracellular length scale, where recent observations of phase-separated liquid phases (left top image) are relevant to understanding responses inside cells, and (ii) extra-cellular length scales where porous material change shape or regulate run-and-tumble dynamics of swimming bacteria (bottom image) or evolving shapes of biofilms (right top image).