+-- Level +2 ---------------------------------------------------+
| |
| % |
| v |
| |
+---------------------------------------------------------------+
+-- Level +1 ---------------------------------------------------+
| |
| * |
| / \ |
| / \ |
| * *> |
| > |
| |
| |
| |
| |
| * |
| / \ |
| / \ |
| * * |
| > / |
| < / |
| * * |
| / \ |
| / \ |
| * * |
| > / |
| < / |
| * * |
| / \ |
| / \ |
| * * |
| > / |
| < / |
| * * |
| / \ |
| / \ |
| * * |
| > / |
| < / |
| * * |
| / \ |
| / \ |
| * * |
| > / |
| ^ < / |
| *--*--% * * |
| |\ | / \ |
| | \ | / \ |
| *--% *--%--*--*--*--*--*--*--*!-*--*--* * |
| v v / |
| < / |
| * |
| |
+---------------------------------------------------------------+
+-- Ground level -----------------------------------------------+
| ^ ^ |
| % % |
| / \ /| |
| / \ / | |
| % *--% * |
| v v |
| |
+---------------------------------------------------------------+
+-- Level -1 ---------------------------------------------------+
| ^ ^ |
| *--% %--% |
| v |
| |
+---------------------------------------------------------------+