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There isn't a difference, but Japanese rock garden is the translated way of "karensui". Zen garden is the western way of saying it.
David Zen Mansley goes by Zen.
Zen (A Buddhist sect)
No, it is not a religion.
Zen is a philosophy, a practice of living, and a lifestyle.
Buddhism is a religion. Zen is a school/ sect within that religion. It is just as possible to have Zen Catholic, Zen Jew. and even Zen Atheist.
zen architecture