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#swiss cheese #holes #gaps #food structure #permeable

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#permeable #groundwater #holes #water flow

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#sponge #absorb #permeable #flow through #filter #holes

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#permeable #filter #membrane #porous #semipermeable #filtration #pass through

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#pores #microscopic #permeable #filter #flow through

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#intangible #pass through #permeable #phase through #no barrier #incorporeal

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#ventilation #airflow #fresh air #open window #air circulation #permeable

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#see-through #permeable #pass through

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#pervious #permeable #pass through #porous #absorbent #strainer #sieve