https://annemichelsen.wordpress.com/illustrations/
http://www.ghmchs.org/thisweek/photo-listing3.htm
http://www.wisegeek.org/what-is-an-elliptical-orbit.htm
http://simpledesktops.com/browse/desktops/2014/jan/08/orbit/
http://photography.nationalgeographic.com/ photography/photos/best-pod-january-08.html
http://www.patternpeople.com/patterninspiration-synchronized-swimming/
http://www.gettyimages.co.nz/detail/photo/synchronizedswim-team-practicing-royalty-free-image/80050668
http://pixanews.com/sport/chm-po-vodnym-vidam-sporta-2011.html
https://www.vectorstock.com/royalty-free-vector/ synchronized-swimmers-vector-595880
http://stenopeic3.rssing.com/ chan-3438018/latest.php
http://virginie-morgand.tumblr.com/post/117334125686/ work-work-work-on-new-silk-screen-posters-for-my
https://www.youtube.com/watch?v=S52G5pd5Nrc
http://nickyskye.blogspot.co.uk/2012/07/ more-swimming-pool-water.html