24 November 2017
Vol 358, Issue 6366

About The Cover

Cover image expansion

COVER Illustration of a 3D chiral elastic metamaterial that is being compressed from above, causing the material to twist (along with the usual axial compression and lateral stretching or expansion). The darkest orange area denotes the highest degree of deflection. The twist motions, forbidden in ordinary elastic continua, aid the design of complex mechanical architectures. See pages 994 and 1072.
Illustration: C. Bickel/Science