The above are not only introduced into actual water scenery, but are some- times employed in a Dry Garden (Kare sansui), in which water is merely indicated by a channel filled with white or black pebbles and sand. It is a rule that rocks and stones placed in lakes must have their foundations well prepared, and a specially firm support made for those having irregular bases, to provide for the contingency of the water being drawn off and the whole exposed to view. There are many instances in nature in which the large boulders of mountain streams, having fallen from the cliffs above, lie in topsy-turvy positions. For this reason certain top-heavy and abnormal shapes are often permitted for the large stones in garden rivers, provided that they are overgrown with moss and lichen, suggesting age and the action of natural forces.
