One of the biggest contraptions here this year is this fantastical roller coaster. Tell me about this. So this roller coaster was based on a design by Stullo from Holland Brickride.com and they posted a video of their roller coaster and the tranks and how to make them. And I looked at it and I thought, oh that's going to be easy. It's just a really mistake. But basically it's all standard Lego parts. There's one piece of long wire that isn't Lego but everything else is totally Lego. It's about 200 hours of effort I think it's 200 hours of effort. I think it's 200 hours of effort I think it's 200 hours of effort. It's a bit of a blur and this and that's really good because we can actually get the kids to interact with the display to just excuse me a minute. Do you want to have a turn making it start? Up under the rope mate. Put your hands. You see those two orange eyes? Put your hands like that in front. That's it? Just add that. Then pop under. Now there are one or two little quirks in it. So there's a little bit of manual interaction. For example I have to stick my finger under the chain next time. Angle has quite right. But it's working sufficiently smoothly now to make it work. It's pretty much a work in progress. It's not very much a work in progress. It's been changing a lot. If you have a look at this spiral sitting in there which we had in the loop Saturday but it just would lead to much speed and wouldn't make it all the way around. So it's been fast and furious work at the end of the day each day to try and get it going. Today is probably the day that it's been running the smoothest because we've been able to actually get it to go with the top without a little helping hand. A minute to that time. The best part about this is the interactivity with the kids and they're really loving it. Put your hands sideways. So had you had another week what would it look like? Probably similar mate. It's because of the size of it. It's not the kind of thing that you can easily build a comb. So I built parts a bit at home. But it really came down to the down vet is going to be the challenge. It was a challenge at home. I did actually try and mimic the brick rides original design and they've got some amazing bank pills in the loop. I tried doing that and I just flew the tracker part. That's why I then attempted this spiral. I think it'll be a work in progress next year so hopefully it'll be a bit less stressful. Just a tweak in the physics. Well of course everyone from the lug coming along and offering advice somehow. How do you need to do? Much appreciated everyone. I'm just going to get the next step. Thank you very much. So come along to the brick show, check out the roller coaster, come along next year and see how far David gets and making it work flawlessly. Thanks David. Thanks mate. That's it. That's it. Then put back on the and a little bit of an LP. Magic can't get a back to all the time. We're exhausted.