You can change the pieces at will and even shape your own personal pieces from the material. We hope that these pieces will help you to discover your own musical world within yourselves, and to let yourselves and others hear its sound."
The composer offers a wealth of stimuli and suggestions to help the learner achieve this. Monika Thiery's supplementary comments facilitate the use of the 18 pieces in teaching.

In her Intervallbuch Heller applies this successful concept to the other intervals.