âIt is not just about decorating the worldâ¦ but about taking responsibility,â Olafur Eliasson said of his practice in a 2009 TED Talk. Eliasson uses natural elements (like light, water, fog) and makeshift technical devices to transform museum galleries and public areas into immersive environments. Prompting reflection on the spaces surrounding us, for Green River (1998-2001) he poured bright green (environmentally safe) dye into rivers running through downtown L.A., Stockholm, Tokyo, and other cities to âshow the turbulence in these downtown areasâ and to remind passersby of the citiesâ vitality. Similarly, by installing four large waterfalls in New Yorkâs East River (2008), he intended to give the city a sense of dimension; Eliasson also famously installed a giant artificial sun inside the Tate Modern (The weather project, 2003). Known for their elegant simplicity and lack of materiality, his installations are rooted in a belief that art can create a space sensitive to both individual and collective.