Never heard of aluminum foam???
AlusionTM is a division of the innovative materials technology company, Cymat Corp. Located in Toronto, Canada, Cymat holds the worldwide patent for the production of AlusionTM. Alusion was established to bring Cymat's unique Stabilized Aluminum Foam (SAF) technology to the architectural and design markets.

The brand 'Alusion' was created to market Cymat's aluminum foam to the architectural and design industries. AlusionTM was adapted to suit specific industry needs and various versions were created for a broad range of architectural and design applications.

This will be a cool approach to outdoor tiles, where grass can grow beneath and show thru the tile... or even as a wall panels