icosahedron

There were twenty rooms, each connecting to three others, arranged like the vertices of a dodecahedron (or the faces of an icosahedron).
其中有20个房间，每个房间与另外三个相连接，排列像一个dodecahedron的顶点（或者是一个icosahedron的面）。
The icosahedron has the greatest number of faces , so it is the most common choice for making a geodesic dome.
正二十面体是拥有最多面的柏拉图方体，所以它最常用于建造短线圆顶。
And you can see how the icosahedron withdraws into the dodecahedron and then they just merge into each other.
你看这个二十面体会变成十二面体，这两者结合的很好。