Windvogel are smart kites designed by Studio Roosegarde that create green energy as they twist in the wind. Windvogel have the potential to create up to 100 kilowatts of green energy and the string of the kites are luminous, meaning they glow in the dark. "You have these beautiful dancing lines of light floating in the air and at the same time producing green energy," said Daan Roosegaarde. The smart kites floated in the air at the Icoon Afsluitdijk exhibition in 2017, attached to a dynamo generator by a cable at the base. This push and pull of the cable transforms into electricity, like a bicycle. Roosegaarde wanted to bring green energy, art and landscape design together through the Windvogel project.