Slime Vision (IMAGE) eLife Caption Bacteria are optical objects, each cell acting like a microscopic eyeball or the world's oldest and smallest camera eye. Credit eLife Usage Restrictions With a credit to eLife, linking or hyperlinking to the paper via the DOI: http://dx.doi.org/10.7554/eLife.12620 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.