Sound perception can occur on two levels - visual and auditory. Both of these dimensions interpenetrate each other. By creating geometric patterns, sounds create matter. Cymatics is the science that allows us to see the shapes created by specific sound frequencies. Sound vibrations compact matter, creating various patterns. The shapes of physical structures also produce sounds (vibrations), usually in the form of infrasound that is inaudible to the human ear. In architecture, you can discover relationships with figures created when sound interacts with matter. Any object can be a generator or amplifier of sound wave energy. The architectural shapes may refer to Chladni's figures. These figures reflect the places where the nodes of the standing wave occur. The shape of the audience of the auditorium (theater) is determined at the architectural design stage. The correct arrangement of seats and transitions between them in the audience area may be closely related to its shape and dimensions. This plane, vibrating, forces the arrangement of transitions in places where there are sound pressure nodes, and seats in places of maximum sound pressure level. This is a new approach to shaping interior architecture for the audience of auditoriums.