Work On Felt (Variation 13), Grey stretches the boundaries between sculpture and instrument, presenting a taut string of carbon fiber suspended across a large panel of industrial felt, mounted to project outward from the wall at a deliberate angle. The carbon fiber element is not merely structural but functional, capable of being played like a string instrument, with a concealed microphone feeding vibrations through a guitar amplifier to fill the surrounding space with resonant, unpredictable sound. Tsabar constructs objects that exist simultaneously as visual forms and acoustic events, collapsing the distinction between what is seen and what is heard, between the static and the activated. Produced in 2016, this work belongs to Tsabar's acclaimed series in which felt, a material historically associated with both acoustic dampening and the Arte Povera tradition, becomes a charged field of latent energy. The grey palette enforces a restrained, almost industrial aesthetic that draws full attention to the tension of the string and the subtle topography of the felt surface beneath it. The sculpture rewards both passive contemplation and active engagement, since a viewer who chooses to pluck the string transforms the work entirely, collapsing the boundary between audience and performer. Measuring 179.5 by 137.5 by 93 centimeters and bearing the artist's signature, this work carries considerable physical presence in any collection context. Tsabar, whose practice has been exhibited internationally at major institutions, is represented by Dvir Gallery, and this piece stands as a compelling example of her broader inquiry into bodies, architecture, and the politics of sound. It suits collectors drawn to work that refuses fixed categorization, occupying the fertile ground between minimalist sculpture, relational practice, and sound art.