Wiktionary
n. The ancient Japanese art of creating miniature landscapes on black lacquer trays using sand and pebbles.
Wikipedia
Bonseki (盆石; lit., tray rocks) is the ancient Japanese art of creating miniature landscapes on black lacquer trays using white sand, pebbles, and small rocks. Small delicate tools are used in Bonseki such as feathers, small flax brooms, sifters, spoons and wood wedges. The trays are either oval or rectangular, measuring about 60 by 35 centimeters in size. Oval trays have a low rim while rectangular ones are flat.
Bonseki scenes often depict mountains, seashores, and gardens. Small stones are used to represent mountains, shore lines or rocky islands that waves break upon. Miniature structures, usually of painted copper, are sometimes added to the work to make houses, temples, bridges, and the like.
Bonseki scenes by design are generally meant to only be temporary. Sometimes, by using special methods, a Bonseki scene can be preserved. This is called either Bonga ("tray picture") or Suna-e ("sand picture").