Hanging garden

[1] Space optimization is the main intention with the gardens, with aesthetics and providing cleaner air also commonly cited reasons.

[2] Hanging gardens are popular in urban environments with limited space such as in New York City or Los Angeles.

Considered one of the Seven Wonders of the Ancient World and the source of the term, the Hanging Gardens of Babylon are still of uncertain historicity.

[3][4] Another example of "reclaiming for nature the land occupied by the building" in the form of hanging gardens is the modernist Villa Savoye by the Swiss-French architect Le Corbusier, a project mentioned in his Five Points of Architecture.

Perhaps the most well known hanging garden would be the one attached to the Trump Tower, where occasionally trees will be planted in each section of the slanted side of the building.

[6] Vertical farms are another version of hanging gardens that have become much more common within the last decade, usually being grown indoors and stacked on top of each other to take up the least amount of horizontal space.