Library Steps
=============

+-- Ground level ---+
|   ^               |
|   *               |
|   |               |
|   |               |
|   M               |
|   |               |
|   |               |
|   *--M            |
|      |            |
|      |            |
|   *--*            |
|   |               |
|   |               |
|   *--*            |
|      |            |
|      |            |
|   *--*            |
|   |               |
|   |               |
|   *--*            |
|      |            |
|      |            |
|   *--*            |
|   |               |
|   |               |
|   *--*            |
|      |            |
|      |            |
|   M--*            |
|   |               |
|   |               |
|   *--*            |
|      |            |
|      |            |
|      *            |
|      |            |
|      |            |
|      *            |
|      |            |
|      |            |
|      *            |
|      |            |
|      |            |
|      *            |
|      |            |
|      |            |
|      *            |
|      |            |
|      |            |
|      *            |
|      |            |
|      |            |
|      M            |
|      v            |
|                   |
+-------------------+