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