Causas Externas is a young design collective based in Barcelona who create experimental objects that play with the border between interior and exterior.

One of their objects 'Grass Tiles', is a modular object that makes it possible to add pieces of grass to your habitat.

The tiles comes in movable squares and can be used in either indoor or outdoor spaces such as terraces or houses with no garden or even an office space.

• www.causasexternas.com