Draw twelve evenly spaced boxes. One repeating pattern marks every third box; another marks every fourth. Before making any sound, you already have a small composition question: where do the two patterns meet?
Agree what the count means
For this original exercise, mark the shared starting point as 0, then place one series at 3, 6, 9 and 12 and the other at 4, 8 and 12. Their next shared mark after the start is 12. Keep the underlying pulse steady and comfortable.
Use two quiet, easily distinguished sounds if you want to hear the sketch. A soft tap and a gentle spoken syllable will do. Avoid striking fragile objects or increasing the volume to make the pattern feel more impressive.
Learn each line before combining them
Follow the three-beat marks alone, then the four-beat marks. With a willing partner, divide the lines and count together. If the combined pattern slips, slow down or return to pointing at the paper.
This is not a test of musical ability. The drawing is part of the listening tool. Our guide to using shapes instead of notation offers another way to make timing visible without needing a score.
Listen to the spaces between meetings
When both lines are comfortable, notice the changing gaps between their sounds. The shared pulse stays the same, but the combined sequence can feel less regular than either line alone.
Finish by choosing a clear ending at the shared mark. You can then change one sound while preserving the counts and compare the result. A very small rule has produced enough material to explore without needing a long track or a complicated instrument.