Thanks to Geva for sending in this great project. A brain monitor is connected to an Arduino so it can detect when the user is concentrating. When this happens a mild electric current is applied to the water in which there are hundreds of microbes swimming about. As soon as the current is applied they immediately start swimming towards the top of the screen where the negative pole is. Kind of freaky, not sure if there are any practical applications for this but it is sure cool!
Want to build your own? Check out how to Control Microbes with your Mind also.