This exercise can be for one or a group working together.
List of materials:
Tracing paper – A4
Colored pens or pencils
Draw one straight line in any color any place on the tracing paper.
Draw a second line on another piece of tracing paper and place it under the first drawing.
Keep doing this any number of times.
See as follows.
By the end you have made a stack of drawings almost like a sculpture. Each drawing can be moved and changed creating new pieces each time.
This exercise was contributed by Karl Burke (http://karlburke.blogspot.ie/).