The interval of a third serves as the central theme of this piece. At the opening, the right hand descends for four measures using descending thirds. From the subsequent measure 5, the left hand responds with ascending thirds. In measure 8, just as the left hand seems poised to ascend further with 'G-B', the right hand abruptly takes its turn to descend again with 'D-F#'. However, the left hand immediately counterattacks in the following measure 9 with 'F-A' in an ascending shape, and this interplay of descending and ascending figures between the right and left hands continues until measure 14. This section, with its sense of tension and rivalry, would be interesting if one could convey the feeling of each hand continuously challenging the other. From measure 15, the left hand takes a solo lead, but surprisingly, in the final four measures, the right hand transforms into an ascending figure of a fourth, bringing the piece to a close.