A returning idea can make a very small sound sequence feel organised. Choose two gentle sounds you can make comfortably, such as a soft tap and a quiet brush across paper. This exercise needs no special equipment or claim to formal composition technique.
Give the opening a recognisable shape
Make a short pattern using the first sound: perhaps two taps followed by a pause. Repeat it enough to remember, then introduce the second sound for a contrasting middle section. Finish by returning to the opening pattern.
Keep the entire sequence brief. If there are too many changes, it becomes harder to tell which part you recognise when it returns. Write a simple sequence of letters or marks if that helps you repeat the experiment.
Change only the middle
Try a second version with a longer pause or a different number of brushing sounds in the centre. Leave the opening and ending unchanged. Does the return feel more expected, more abrupt, or simply different?
Describe your response without making it a rule for all music. A friend may hear the same sequence another way. The point is to experience how repetition and contrast can organise attention, then carry that question into a song or instrumental piece you already enjoy.