Modern Photography Heidersberger, Heinrich Rhythmogram. 1950s. Gelatine silver print on Velin card. 39.8 x 39.8 cm. Stamped by the photographer on the reverse. – Slight scratches and edges slightly rubbed; holes in the upper corners from previous mounting. Overall in very good condition. Clean print. This work is characteristic of Heidersberger’s oeuvre; he developed the ‘Rhythmograph’ apparatus specifically for the production of his Rhythmograms. Via a mechanically coupled mirror and a point-source light, four harmonically damped pendulums create complex light trails on light-sensitive material. The interplay of frequency, amplitude and phase shift results in three-dimensional light drawings of formal elegance. The works uniquely combine artistic creativity with scientific precision. Gelatin silver print mounted on wove board. Verso bearing the photographer’s stamp. – Minor surface scratches and slight rubbing to the edges; the upper edges show holes from previous mounting. Overall in very good condition. A clean print. - This work is characteristic of Heinrich Heidersberger’s oeuvre, for which he developed the Rhythmograph, a unique apparatus used to create his celebrated Rhythmograms. Through a mechanically coupled mirror and a point light source, four harmonically damped pendulums generate complex traces of light on photosensitive material. The interplay of frequency, amplitude and phase shift produces elegant light drawings with a striking sense of spatial depth. These works represent a unique synthesis of artistic creativity and scientific precision, exemplifying Heidersberger’s fascination with both aesthetics and technology.