you are unable to re-enter the rectangle.
the door seems to be locked from the inside.

climb the rectangle

hit the door

walk around


 |‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾|
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |                                                                  |
 |                                                                |‾ =__O   
 |                                                                |  =  |\
 |                                       O┴┘                      |  = / \
 ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾