How was it done? Each pentagram is a 3D quantum system with an orthonormal basis { | A ⟩ ⟩ , | B ⟩ ⟩ , | C ⟩ ⟩ } . Each pentagram is initialized to | C ⟩ ⟩ . Each vertex is assigned a 1D projector projecting to 1 5 | C ⟩ ⟩ + 1 − − 1 5 [ cos ⁡ ⁡ ( 4 π π n 5 ) | A ⟩ ⟩ + sin ⁡ ⁡ ( 4 π π n 5 ) | B ⟩ ⟩ ] , n = 0, ..., 4. Adjacent projectors commute. If we project, color the vertex red. Otherwise, color it blue.