Sam Zygmuntowicz builds violins in a Brooklyn workshop, and this portrait follows him through the physical craft: carving scrolls, bending wood, varnishing bodies at the workbench. The film's more unusual thread is his effort to quantify what makes an instrument sound great, pairing decades of hand-built experience with computer analysis of acoustic response, comparing graphs and frequency readings against violins by old masters. Zygmuntowicz talks through his process as he works, explaining the choices that separate a good instrument from an exceptional one, while the camera stays close on tools, shavings, and finished instruments being tested by players. The film treats violin making as both trade and open scientific question, watching a craftsman who trusts his hands but wants data to back up his ear. It is a quiet, observational look at a specialist trying to close the gap between traditional craft and measurable science.