![Sydney, Australia](https://www.popsci.com/wp-content/uploads/2019/03/18/DOAP733UWYXLTYHHUEWY3WWYIA.jpg?w=1200)
![Sydney, Australia](https://www.popsci.com/wp-content/uploads/2019/03/18/DOAP733UWYXLTYHHUEWY3WWYIA.jpg?w=1200)
The 381-foot-tall One Central Park in Sydney, Australia, incorporates two unique technologies: A hydroponic garden made up of 383 species that hugs the building’s exterior, and 42 heliostats, mirrors that passively direct solar energy away from apartment windows and onto shaded spaces.