Colloidal Clusters with 6 Particles (IMAGE) Harvard University Caption This is a picture from the optical microscope of two clusters at N=6 particles. The one on the right is an octahedron. Note: The particles are polystyrene spheres, 1 micrometer in diameter. Credit Vinothan Manoharan, Harvard School of Engineering and Applied Sciences Usage Restrictions None License Licensed 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.