Orange and Blue Balls (IMAGE) Penn State Caption Blue and orange balls of different sizes as seen through a confocal microscope. The smaller orange spheres fill in the spaces between the larger blue spheres. Credit Joseph McDermott, Penn State Usage Restrictions Not for advertising use 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.