Cathode Ray Tube

In old Tv the Cathode Ray Tube was a vacuum tube containing an electron gun (a source of electrons) and a fluorescent screen, with internal or external means to accelerate and deflect the electron beam, used to create images in the form of light emitted from the fluorescent screen.
To create images the electrons must pass through a perforated plate, which directs the flow.Soon after, they collides with the fluorescent screen, which completely blocks the rays, transforming them into light.

Conceptual Map

To Filter

To Flow                                                To Protect

Waterproof/

Porous

To Assimil                                              To Absorb

To Refuse

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Zeolite

Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents.
Zeolites are widely used in industry for water purification, as catalysts, and in nuclear reprocessing.

Synthetic zeolite structure

Synthetic zeolites hold some key advantages over their natural analogs. The synthetics can, of course, be manufactured in a uniform, phase-pure state. It is also possible to manufacture desirable zeolite structures which do not appear in nature. Zeolite A is a well-known example.

Sanitary napkin

Lagoon

Venice lagoon

Lagoon refers to the body of comparatively shallow salt or brackish water separated from the deeper sea by a shallow or exposed barrier beach,sandbank of marine origin, coral reef, or similar feature.

It is porous, because of the direct contact with surrounding sea, but develops an independent habitat, which can be considered waterproof.

Alphabet

Audio filter
Büchner funnel
Cork
Dream Catcher
Evapotranspiration
Fiber (Optical)
Gore-tex
Haacke, Condensation Cube
Impluvium
Jug (Puzzle)
Kansai International Airport
Lagoon
Mask (Fencing)
Narthex
Osmotic Membrane
Pantheon Oculus
Quicksilver porosimetry
River Delta
Trickster
Submarine
UV Protection
Voltaic Pile
Wright, Fallingwater house
X-Ray Computed Tomography
Yellow (Fractal)
Zeolite