Yuwen Zhang, now at Baxter Healthcare, and I built another shape called a truncated octahedron, which is similar to but more complicated than a cube [see illustration on page 64].

• 现在任职于百特医疗用品公司的张裕文（音译，YuwenZhang）与我做了另一种叫截形八面体的构造，这种构造与立方体类似，但比较复杂（见72页图）。