One of the principal design elements that was important in the creation of the Thummer instrument was that it be ergonomic in both the position of the instrument and the individual movements of the fingers. This ergonomic importance was not solely for the comfort in playing the instrument, but also to aid in the capabilities of how the instrument could be used. With the single hand placement and the close array of keys, a person who has mastered the Thummer will be able to play much faster than a typical keyboard.
Using Fitts law, the Thummer is expected to take only 25% of the time that is needed to find individual keys. This means that the intervals between notes can be dramatically shortened and a faster speed of playing be employed. The Fitts law is most commonly used in settings that involve human and computer interaction, but the design of the Thummer is built upon these ergonomic principles to great effect.