This is Daedalum, an inflatable structure 153 feet in length. This was created by Architects of Air, an organization founded by designer Alan Parkinson. Together with his team, they create a new luminarium every year.
… [The Daedalum has just been] recently installed in London as a part of the Greenwich + Docklands International Festival. Light fills the labyrinth’s tunnels through colored panels made of translucent material, bathing the interior in bright and ethereal hues.
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(Image Credit: Architects of Air)