+-- Level +3 -------------------------------------------+
| |
| % |
| |v |
| |^ |
| % |
| |
+-------------------------------------------------------+
+-- Level +2 -------------------------------------------+
| |
| % |
| |v |
| | |
| * |
| | |
| |^ |
| % |
| |
+-------------------------------------------------------+
+-- Level +1 -------------------------------------------+
| |
| *--* |
| / | |
| / |^ |
| * % |
| | |
| | |
| * |
| | |
| | |
| * |
| / |
| / |
| * |
| \ |
| \ |
| * |
| \ |
| \ |
| % |
| v |
| |
+-------------------------------------------------------+
+-- Ground level ---------------------------------------+
| ^ |
| % |
| \ |
| \ |
| * |
| \ |
| \ |
| * * M |
| \ | | |
| \ | | |
| *--*--* * * |
| / \ | / |
| / \ | / |
| * *--*--* |
| / | \ |
| / | \ |
| * * *--* |
| | | \ |
| | | \ |
| M * *--* |
| \ |
| \ |
| * |
| \ |
| \ |
| *> |
| |
+-------------------------------------------------------+