Evolution Door by an Austrian artist Klemens Torggler.
Instead of a single panel attached to a frame by two hinges, Torggler?s Evolution Door folds into four triangular sections that collapse in on themselves and turn round before straightening back up into a rectangle.
?The special construction makes it possible to move the door sideways without the use of tracks,? explained Torggler. ?This technical trick opens up new applications for the door.?
http://memolition.com/wp-content/uploads/2014/02/folding_evolution_door_03.gif
Instead of a single panel attached to a frame by two hinges, Torggler?s Evolution Door folds into four triangular sections that collapse in on themselves and turn round before straightening back up into a rectangle.
?The special construction makes it possible to move the door sideways without the use of tracks,? explained Torggler. ?This technical trick opens up new applications for the door.?
http://memolition.com/wp-content/uploads/2014/02/folding_evolution_door_03.gif
