This is just a short tutorial about Shadows that only go halfway up the
wall...confused?  Just check Wall.map and you'll get the idea.

1) Create a room, any size you want.

2) Add a box to the side of the room.

3) Using the 'Page Up' key to bring the floor to the desired height.

4) Bring the corners of the extra box in so that the room is now like
in step one, except part of one of the walls is red.

NB/ The map for these steps are in the top left hand corner of Wall.map.

There, done.  The wall is now split in two, meaning that two different
shades and wallpapers can be placed vertically on one wall.