Moiré pattern evolution (IMAGE) University of Konstanz Caption Schematic illustration of the moiré pattern evolution under the influences of external forces and torques for a circularly shaped colloidal cluster interacting with a periodically structured surface. Regions where the particles of the cluster are close to the bottom of the wells of the patterned surface appear as dark-coloured regions in the respective moiré patterns. The width of the arrows represents the amount of force and/or torque required to overcome the static friction between cluster and surface. Credit © Andrea Silva and Xin Cao. Usage Restrictions May be used by the press. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.