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I think ##\left | 0 \right >## and ##\left | 1 \right >## are orthonormal vectors, then why they seem to apear parallel in the Bloch sphere?

Also, I can understand the ##cos \frac \theta 2 \left | 0 \right >## part, but I cannot understand how ##e^{i \phi} sin \frac \theta 2 \left | 1 \right >## part can match the fig.

Thanks!