That looks like an interesting book .
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user
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 .
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assistant
There are the pyramids . It ’ s easy to see how they got that name ! they don ’ t have smooth sides though .
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user
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 .
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assistant
Look at that cylindrical office building . I ’ Ve never been seen one that shape before .
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user
Yes . Usually only TV towers are cylindrical in shape .
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assistant
TV towers are usually thicker at the bottom than at the top . They ’ re not perfectly cylindrical .
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user
This is the world ’ s largest sports stadium . It ’ s a massive oval .
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assistant
What sports do they play there ?
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user
It says here that it ’ s m mainly used for big football matches and athletics meetings .
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assistant
Is that building a perfect cube ?
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user
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
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assistant