Originally published on psfk, by Emma Hutchings:

Developed by AgenciaClick Isobar, this billboard for Nivea sunscreen in Rio de Janeiro, Brazil, features a mosaic made up of 1 million white beads that become colorful when exposed to the sun. The creative advertisement is on display in the sunshine during the day and at night offers a teaser message.

The artist even used the sunscreen itself on the beads to create different shades on the coloured beads! I like this sunscreen already! Watch how this amazing mosaic is made in the youtube video

https://www.youtube.com/watch?feature=player_embedded&v=LkP9zKchKE8