Instructions:

1. In black marker, draw a line from end to end as expressively as one desires.

2. In red marker, draw a line below from end to end which closely follows its predecessor, but never touch it.

3. In yellow marker, draw a line below from end to end which closely follows its predecessor, and never touch it.

4. In blue marker, draw a line from end to end which closely follows its predecessor. The lines may never touch.

5. Take breaks. Pick up where the marker left off.

6. Repeat from red until the end of the wall.