answer: #Person1# and #Person2# are reading an interesting book that contains pictures of interesting buildings from all over the world, with brief descriptions of how they were built, their purposes, and so on. They discuss the shapes of the buildings.
documents: #Person1#: That looks like an interesting book.
  #Person2#: It is. It's got pictures of interesting building from all over the world, with brief descriptions of how they were build, their purpose, and so on.
  #Person1#: There are the pymeids. It's easy to see how they got that name! they don't have smooth sides though.
  #Person2#: They don't now, but most of them did originally. There's picture of the pentagon in the United States. It's very distinctive with its five sides.
  #Person1#: Look at that cylindrical office building. I'Ve never been seen one that shape before.
  #Person2#: Yes. Usually only towers are cylindrical in shape.
  #Person1#: Tv towers are usually thicker at the bottom than at the top. They're not perfectly cylindrical.
  #Person2#: This is the world's largest sports stadium. It's a massive oval.
  #Person1#: What sports do they play there?
  #Person2#: It says here that it's mainly used for big football matches and athletics meetings.
  #Person1#: Is that building a perfect cube?
  #Person2#: According to the book, it is. I'Ve never seen a building that is a perfect cube. Look at the building. From the air, it looks like a square with a semi-circle attached to each of its four sides. What kind of building is it?
  #Person1#: Is says here that it's a war memorial. Now, there's a distinctive structure-the stomium in Brussels. See? It consists of several connected by cylinders. I believe you can go up and down inside it.