It has become somewhat of a tradition over the past few years for the Sydney Town Hall to have art projected onto it during Christmas. It seems we have now expanded on the concept in both idea and scale, with both the MCA and the Sydney Opera House now decorated with light for the Vivid Sydney event. Sydney Opera House's projections are based on 300 paintings which are mashed together in software, so I have a feeling every change is unique. The pattern changes subtly in intervals between 5 to 20 minutes.