 Now, we're an international class and if you set up a house in a warmer climate, so in subtropical, tropical areas or in like the hot arid climates like the Middle East, northern African countries, what is once again a very different climate because it can be cold in winter still, even snow sometimes in like down to Egypt, very rarely but it can happen. But it is colder in winter and it can be pretty chilly at night times and the desert climate is very, very cold at night, very, very hot over days. So that's once again a different climate that I don't address too much here. But for more tropical areas we need a different orientation and that is we don't want the building to be heating up by the sun. So what does that mean for a building? How would you make the orientation of windows? Where should windows go in a more tropical climate where the sun is going like this? Yes, the windows should be north-thous. It's counter-intuitive maybe but the sun is beating in the morning because then it's going into the building, into the glass and can heat up horribly. So you don't want big glass at that side. On the other side when the sun is hottest it comes from above. So it will not go into windows and so thousand north-facing windows will not heat up. And I have seen a stunning example of how modern architecture is going crazy in some place. When you drive from Dubai to Abu Dhabi on the main road, drive carefully, there is speed limit control radar device every one kilometer, very very harsh regulations there and it's very expensive to violate that. And then around halfway towards the direction of Abu Dhabi you see a round building. It's huge. It's really a tall exactly round thing. What is basically beautiful as it is made. The glass, it's concave and of course I was curious when I drove by what's the orientation because with this building if it's facing east-west with the glass it would be a sort of solar collector. If it's other way around it would be pretty good because the part of the building that's facing morning and afternoon sun is minimal. And I was a bit shocked to see that it was really, it was the wrong way around. So it was a machine to be heated up and to be cooled down with a lot of energy. So probably mega watts go into cooling it down because it's the wrong orientation. But of course for architects it's like driving by, you should see it from far away and