. - and that's because its architect, jorn utzon, designed with sustainability in mind.tiles are self—cleaning. the spherical design of the structure allows for good drainage, and the only thing that washes it is the rain. every five years, each tile is manually inspected and digitally catalogued — all 1,555,000 of them. that's a lot of tiles. so that's a lot of inspections that we need to do around the building and software like this allows us to actually strip the building down and monitor. so if i had this sort of software ten years ago, i would know that, you know, the materials i use, i'd be able to monitor the health of the building and really have a data log for, you know, when i leave the opera house, the next person who takes myjob, they'll know how i've repaired it. so this sort of information will help the longevity of the building continue. how do you tackle the challenge of retrofitting this heritage building? we feel a great sense of responsibility to not just care for this place and to treasure and renew this building for future generations, but we also ta