Bottom Line
The promise of quantum computing to offer super-fast solutions to optimization problems or virtually foolproof ways to safely send messages depends on twisting qubits, and by association, rotating their qubelets through arbitrary angles.
Although the Bloch sphere is traditionally used to
depict the gradual blending of quantum states
from a pure 
state at the
north pole to a pure 
state at the
south pole, its 3D shape makes it hard to visualize
the actions of quantum gates. The model described in
Modeling Quantum Bits with the Qubelets ...
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