Japanese dry gardens—karesansui—have minimalist motifs conducive to meditation. Instead of water, gravel flows through a landscape. The concept owes its popularity to the success of century garden designer Musō Kokushi (a Zen Buddhist monk).
Most people want a beautiful garden of their own in their house, but this dream may not come true because there's no space for a backyard. Some people are fortunate enough to have a rooftop which can be turned to a dreaming garden.