A Precarious Winding Trail
==========================

+-- Ground level --------------+
|                              |
|                           M  |
|                           |  |
|                           |  |
|                           *  |
|                           |  |
|                           |  |
|                     *--*--*  |
|                    /         |
|                   /          |
|                  *           |
|                   \          |
|                    \         |
|                     *        |
|                    /         |
|                   /          |
|               *--*           |
|                   \          |
|                    \         |
|                     *        |
|                    /         |
|                   /          |
|                  *--*        |
|                    /         |
|                   /          |
|                  *           |
|                 /            |
|                /             |
|            *  *              |
|            | /               |
|            |/                |
|            *                 |
|             \                |
|              \               |
|               *              |
|                \             |
|                 \            |
|               *--*           |
|              /               |
|             /                |
|  <*--*--*--*                 |
|                              |
+------------------------------+