The first prototype computer mouse, developed by Bill English and famously used by Douglas Engelbart in "The Mother of All Demos", a demonstration of the oN-Line System in 1968.
Rights: This image was originally posted to Flickr by Mulad. It was reviewed on 15 May 2014 by FlickreviewR and was confirmed to be licensed under the terms of the <a href="https://creativecommons.org/licenses/by/2.0/">cc by 2.0</a>