Olafur Eliasson is a Danish-Icelandic artist known for exploring light, colour, movement and how people experience space. His installation Your uncertain shadow (colour) (2010) uses five coloured lights to create overlapping shadows on a wall. As visitors move around, their shadows change in size, shape and colour, making them part of the artwork and creating an interactive experience.

https://olafureliasson.net/artwork/your-uncertain-shadow-colour-2010