Amsterdam Light Festival 2015 featured “Light Wave”, a light artwork by Anita Doornhein in Amsterdam.
'Light Wave' is a transparent, deep blue, installation on the water. It was one of the largest works of the fourth edition: twenty meters long and eleven meters wide. That's necessary, because boats can sail through this transparent wave.
Programme information from Amsterdam Light Festival. Short excerpt quoted for reference; see the original page for full text, images and credits.