Foremost, the geometry of the plan provides nonparallel walls that limit sympathetic resonance.
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Nonparallel shafts can be connected if the belt's center line is aligned with the center plane of the pulley.
From the en.wikipedia.org
Even though it's only a mere transient dipole moment, this moment can cause a nonparallel dipole moment in an adjacent molecule.
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Closely spaced, wrongly spaced, or nonparallel bedding planes can make the stone unusable, particularly if the bedding planes are planes of weakness.
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The nonparallel views of different groups at different points on the economic scale mean that advancement in some groups could be counter to the goals and directions of another group.
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More examples
Serial: of or relating to the sequential performance of multiple operations; "serial processing"