Astronaut Clayton Anderson watches as a water bubble floats in the middeck of space shuttle Discovery during the STS-131 mission. Note that his image in the bubble is upside down because the bubble refracted the light.
NASA
www.nasa.gov : <a rel="nofollow" class="external text" href="http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts131/multimedia/photogallery/100412.html">HTML</a> : <a rel="nofollow" class="external text" href="http://www.nasa.gov/images/content/443963main_131fd8-1_full.jpg">JPG</a>