Although Schumann, his wife and his children often played the upright piano, and most pieces of the Album for the Young are certainly also designed for the room piano, this pieces is special: At the end, when it modulates to the final C major chord in the final 9 bars, Schumann noted an open right pedal and above "Verschiebung" (Displacement). He ment to open the left pedal of the grand piano. On a grand piano the left pedal has different mechanical function as on the upright piano. It moves the hammers a bit sideways, so that only two of the three strings (trichords) are played and the third string is open and resonating. This produces a very soft and quieter tone (Debussy and Chopin often uses that effect). On the upright piano the left pedal moves the hammers more closely towards the strings, so the sound is quieter, but still all three strings are hit. Schumann uses the left pedal "Verschiebung" (which was pretty new at the time) only once in the Album for the Young. He wanted that special sound effect in this piece, which can only be produced on a grand piano. Maybe he wanted to introduce the pupils to the differences between the piano versions and to try out a grand piano (which is for smaller hands more difficult to play).