A Colorful Resonance (IMAGE) Washington University in St. Louis Caption The color of a suspension of nanocages depends on the thickness of the cages' walls and the size of pores in those walls. Like their color, their ability to absorb light and convert it to heat can be precisely controlled. Credit WUSTL 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.