a) Impression (inception towards death) generates expression (life), hence being within implying pressurization.

b) Suggested system (assemblage of things adjusted into a regular whole) tempts one to ignore that whole separates self into partials, hence oneself being a partial (perception) within whole (perceivable).

c) Suggested vaccum (empty space) tempts one to ignore being partial within whole/full/fill, since only within whole can a partial wander (Latin spatior; space) around.

d) Matter can only be within momentum of motion...a "vaccum" without matter cannot be, unless being ignores momentum of motion.