There are many reports on Jürg Jecklin and his inventions such as the Jecklin float or the Jecklin disc on the net that are worth reading.
Some links to Jürg Jecklin's developments on this can be found here:
Tech History Headphone Review: The 5 Most Avant-Garde Headphones of All Time
Headphone Review. The Float from minute 3:16
Reddit Vintageaudio zum Jecklin Float
Review at Gearspace:
Headphone Reviews at Stereophile.com
MDW Webmagazin: Jürg Jecklin – soundengineer with inventive talent