BS: In terms of managing it there's quite a lot issues there but what about in terms of the actual science that results from that kind of changeability?
DB: Oh. I think, well, because you're doing a different theme obviously you have to have different props, because the props are completely - you know - for Forces show and Light and Colour show the props you're going to use are completely different. And as I said, they have to relate back exactly what the theme is so - I think the exhibition tends to be, because the exhibition tends to cover - quite a lot of different areas, it tends to be fairly static. There are changes occasionally, you, like MusiQuest may come in and they'll put some stuff up. The Hub, upstairs, that changes but that comes under Heather. I don't know if you're going to interview her but, she tends to look after that. So whatever's in the - theatre or in the planetarium they try to link something up on the floor somewhere with that. So, it may be a trail on the floor and they'll pick 6 exhibits which link in what's in the science theatre. But I think if you - because of the change of the - whatever the theme is in the science theatre obviously you have to change all the equipment as well, because it has to link into whatever the theme is, you know, so, I think you - just has to be done, you know so.