Horizontal+Circulation!

What are the four practical requirements of any horizontal circulation system mentioned in the lecture?
===It must be adequate in size, points of converging traffic must be expressed, changes in level must be expressed too and the directness, because a good circulation plan should work well in either direction. ===

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===What are the three examples (names of buildings) mentioned by Prof. Watanabe to illustrate different horizontal circulation patterns? ===

Why is the concept of Horizontal Circulation important in any urban plan or architectural design?
===Because circulation doesn´t have only an aesthetic value, It has a functional value as well. Circulation should give the impression that they lead to some definite place. If one can see ahead in your road, progress becomes easy and pleasant. === ===Circulation is then a necessary element to stablish the relationship between the parts and the whole, and to give a general sense and form of an entire structure. ===