Photo by Flickr artist AliEN .:Gergo Antal:. 

Photo by Flickr artist AliEN .:Gergo Antal:. 

Photo by Flickr artist alexxius (Ivan Alexandru)

Photo by Flickr artist alexxius (Ivan Alexandru)

Photo by Flickr artist .FotoMiradas. (David Azanza)

Photo by Flickr artist .FotoMiradas. (David Azanza)

Photo by Flickr artist Sheridan Gilmartin.

Photo by Flickr artist Sheridan Gilmartin.

Photo by Flickr artist fangleman (Kevin Kemmerer)

Photo by Flickr artist fangleman (Kevin Kemmerer)

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Audio file for the presentation demonstration. Ocean waves sound file courtesy of Luftrum, downloaded through freesound under creative commons license.