Master-level dry landscape gardening refers to the art of creating dry landscapes, specifically the Japanese Zen rock garden known as 'kare-sansui'. These gardens are characterized by minimalist design, using stones, moss, and raked sand to represent natural landscapes, often mountains and water. Mastery in this art form involves a deep understanding of Zen philosophy and the ability to convey a sense of tranquility and natural beauty through a limited palette of elements.