Contents

25 July 2003
Vol 301, Issue 5632

About The Cover

Cover image expansion

COVER Colloidal microspheres compressed by a spherical droplet (center) form ordered structures. These packings are symmetric polyhedra known as convex deltahedra (shown in periphery). Symmetry in matter can arise solely from compression and packing constraints, as described on page 483. [Image: V. N. Manoharan]