The visual analogy fails because light-occluded objects have continuous spatial location grounding persistence, whereas a silenced sound source emits no wave disturbance and thus has no comparable physical continuant.

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Light-occluded objects(Example of something that still exists in a specific location even when we can't see it): Objects that are hidden or blocked from view by something in front of them.
Physical continuant(A lasting physical thing you can point to; the statement argues sound waves don't qualify): Something made of physical matter that continues to exist as the same thing over time.
Visual analogy(Derrida's use of sight-based examples to explain language and communication): A comparison or explanation based on how vision and sight work, used to understand something else (in this case, how language functions).
Wave disturbance(Used to explain what sound is—vibrations moving through space): A vibration or ripple that travels through air or another medium, like sound or water waves.
persistence(Weyl's distinction between two kinds of constancy): Constancy maintained because a quantity is isolated and undisturbed, as opposed to actively adjusted
spatial location(as used in metaphysics): The physical position or place where something exists in physical space—like saying a chair is in the living room.

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