Depicting in a visual way the spaces in between objects.
Looking at the spaces that exist between buildings and walls as much as possible without using the actual objects or buildings as a focus in the drawing.
You will need to find a space where there is a large presence of negative space.
In the city there are large areas of negative space along streets between buildings. Open cut mines are great spaces or spaces in a large shed. Spend some time looking at areas around where you live such as driveways or laneways, to find a negative space that intrigues you.