Since building the Harmononograph, a Victorian pendulum based drawing instrument,in workshops with young people in 2015, led by sound artist Bobby Bird we have taken it out and about around the country to festivals, educational events, craft fairs – even into a shopping centre – where it never fails to fascinate  children and adults alike with its beautiful drawings, representing the harmonic ratios, as well as with the intricate physics and mathematics behind this seemingly  simple, hand built design.