在立方体中心，一个坡度平缓的楼梯给用户在建筑内部位移多提供一种选择。
In the heart of the cube, a gently sloping staircase offers an alternative for moving about in the building.
由于立方体有8个顶点，支持法线的方法之一就是指定从立方体中心指向各角的向量，如图7a所示。
Because the cube has eight vertices, one way to supply normals would be to specify vectors that point from the cube's center toward its corners, as Figure 7a shows.
和球形“地球”具有同等体积的立方体的每个边长应当是10000公里，每个顶点到立方体中心的距离是8700公里！
A cube with the same volume as the spherical Earth would have a side 10, 000 km (6, 400 miles) long so the corners are 8700 km from the center!
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