The First World War centenary was the four-year period marking the centenary of the First World War, which began in mid-2014 with the centenary of the outbreak of the war, and ended in late 2018 with the centenary of the 1918 Armistice.

Spectra is the name of a series of art installations by Ryoji Ikeda which use intense white light as a sculptural material. The most recent presentation of spectra was in Hobart, Tasmania, Australia for four days ending 24 June, 2018 to mark the winter solstice, and as an installation piece at the Dark Mofo festival held by MONA. spectra [Amsterdam] was the first presentation of the work in 2008 its current form; an array of xenon lamps pointed skywards lit from dusk till dawn accompanied by a mathematically derived score audible from each of the lamp bases. The work was first commissioned and produced by Forma Arts.