Twenty photographs taken at five-minute intervals during twilight at the Icelandic volcano Hekla.

'The set of twenty photographs that form The Hekla Twilight Series (2006) confirms the procedural plurality of Olafur Eliasson’s art. The capturing of light and its variations, as an expression of a natural phenomenon, may result in generating a greater awareness of the effects of cosmic temporality in the viewer. "In general terms I came to the conclusion that light is much less intangible than I thought. Light is mostly physical; it has a body, not in a sculptural sense, but in a sort of subconscious sense," the artist has said. For him feeling the material power of light may truly result in a more fruitful way of internalising our humanity.'
(David Santos, 'Olafur Eliasson', from BESart, Banco Espírito Santo Collection, The Present: An Infinite Dimension, web, 2008, p. 126)