A wall of a building is made from blocks that are each 1 cubic foot. The wall is 6 feet high and 6 feet wide.
A window is made by removing some blocks as shown below.
The window is 2 feet high by 2 feet wide.

The wall is 6 feet high and 6 feet wide. The window is 2 feet high by 2 feet wide is cut from the centre of the wall.

What is the volume of the wall after the window is made? Enter your answer in the box.