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

Fractals

Yellow, Antonio Giorgi

A fractal is "a rough or fragmented geometric shape that can be split into parts, each of which is a reduced-size copy of the whole," a property called self-similarity.

The most impressive feature of fractals is that their mathematical dimension is halfway between a line and a surface, in fact they are infinitely porous

A 3D interpretation of Sierpinski triangle

@ Explore Antonio Giorgi Collection

Fencing Mask

Fencing mask has to allow the vision through a metallic grid, and to protect the face by swords attacks, including a bib which protects the neck.

Mask can usually support 12 kg on the metal mesh, 350 newtons of penetration resistance on the bib, however FIE regulation masks must withstand much more, 25 kg on the mesh and 1600 newtons on the bib. Some modern masks have a see-through visor in the front of the mask.

@ Know more about professional fence