Private the observer of the possibility of catching every aspect of the entity in a single act. Depending on the sense to occlude the rules would change, but generically I deal with sight, so I'll obscure some part of the project. If we are talking about sounds, we could heavily insulate a room or whatelse to make it soundproof. Applying the rules to a room, I must obtain a portion of the local obscured, not visible from any direction, but only from a particular innatural position: could be with a curtain or a wall or a system of light that project a shadow there.

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