Survey of Invisibility

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tags:y2025aggregatortransparencyinvisibility

Alpha Channel

A printed page, or pixel can only be one color at a point.

The Alpha Channel was introduced in the late 70s by Alvy Ray Smith and Ed Catmull at the NYIT Computer Graphics lab.

The alpha channel represents the degree of opacity (also defined as transparency) of a computer-generated image, video footage, or the bump, displacement, or opacity properties of a 3D texture. (It must be interposed that not every video, Image, or texture format automatically contains an alpha channel.)

Alpha channels can be used as layer masks and selecting tools.

The use of the term alpha is explained by Smith as follows: “We called it that because of the classic linear interpolation formula

αA + (1-α)B

that uses the Greek letter α to control the amount of interpolation between, in this case, two images A and B.”

Invisible Ball

Invisible Ball

created, =this.created & modified, =this.modified tags:gameslostinvisibility rel: When H.A.R.L.I.E. Was One by David Gerrold

Did you see the invisible gorilla at the table in the corner?

We used to play head games like this all the time in school. They’re best when you’re stoned. Then they’re most real. It’s all about reality isn’t it? If you can get enough people to see the invisible gorilla, then it really is there, isn’t it? - When H.A.R.L.I.E. Was One by David Gerrold

How would a game with a hypothetical invisible ball work?

How would a game with an imaginary ball work?

You can see people mimicking a pass, like throwing a football, and imagine catch (with simulated impact.) How does this differ from the real balls being thrown or the invisible ball?

If we make this game completely rule based, and strict, how would it work?

What happens when a ball is dropped? What happens if there’s ambiguity between passes? (spawning new imaginary balls?) One imaginary ball catch can have multiple interpreted paths even before the catch. The catch can be actually a miss, but the action is mimicking an imaginary catch (a deception.)

Improv Game

There’s an improv game where you stand in a circle. The MC will generate balls with varying traits (easy stuff like heavy, or other prompts like smothered in spaghetti sauce) and pass it to the other players.

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Transparency, In Animals

created, $=dv.current().file.ctime & modified, =this.modified tags:biologyanimalstransparency rel: Butterfly Wings Disruptive Eye Mask

NOTE

Cataloguing times and reasons for animals turning “invisible” through evolved transparency.

Grasswing Butterfly

Firstly, their wings lack the densely packed pigmented scales that are usual in butterflies. Instead, the see-through membrane of their wings is overlaid with sparse, spindly scales leaving gaps for light to pass through.

Glass Frogs

Fascinatingly, it has recently been discovered that this clever camouflage goes even further, with glass frogs possessing the ability to strategically remove red blood cells from circulation when needed, and store them in their liver for a while. This makes them look even clearer and more see-through, as red blood cells are what give blood its vibrant colour.

Research

Applying tartrazine to induce transparency in rats

Achieving optical transparency in live animals with absorbing molecules (2024)

Optical imaging of biological tissues is hindered by the scattering and, to a lesser extent, absorption of light that limits the penetration depth. The authors show that the addition of common dye molecules that absorb in the near ultraviolet and blue regions improve optical transparency in nearby longer wavelengths. In essence, by causing sharp absorption in the blue region, the refractive index in the red part of the spectrum is increased without increasing absorption. The addition of tartrazine was able to make the skin of a live rodent temporarily transparent.

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Yves Klein

The Surfaces and Volumes of Invisible Pictorial Sensibility exhibited invisible paintings.

Yves Klein said “my work is now invisible.”

Their disagreement was so strong that Klein had removed all of his art from Clert’s gallery in August 1959 and had told her assistant to inform any interested buyers that his paintings were all invisible and that if a buyer wanted one, it would suffice to write a check. He further specified that the check had to be very visible.

“Having rejected nothingness, I discovered the void. The meaning of the immaterial pictorial zones, extracted from the depth of the void which by that time was of a very material order. Finding it unacceptable to sell these immaterial zones for money, I insisted in exchange for the highest quality of the immaterial, the highest quality of material payment – a bar of pure gold. Incredible as it may seem, I have actually sold a number of these pictorial immaterial states … Painting no longer appeared to me to be functionally related to the gaze, since during the blue monochrome period of 1957 I became aware of what I called the pictorial sensibility. This pictorial sensibility exists beyond our being and yet belongs in our sphere. We hold no right of possession over life itself. It is only by the intermediary of our taking possession of sensibility that we are able to purchase life. Sensibility enables us to pursue life to the level of its base material manifestations, in the exchange and barter that are the universe of space, the immense totality of nature.”

The Curse by Tom Friedman

In his enigmatic work ‘Untitled (A Curse)’, Tom Friedman presents the viewer with a simple plinth upon which - it appears - nothing rests. Yet, like Yves Klein’s ‘Void’, Friedman’s plinth supports both nothing and something at the same time, for the space above it has been cursed! A treatise on presence and absence, Friedman’s cursed air activates the viewer’s imagination, while at the same time arousing his sensibility of the space that has now magically become perceptible.

At the time I was thinking about how one’s knowledge of the history behind something affects one’s thinking about that thing.

Thought

All these artworks, and all artworks end up invisible.

The Ghost of James Lee Byars

The artwork is the emptiness and darkness of a pitch-black room.

An empty, pitch-black room, the work has since been recreated in several group exhibitions, each providing the darkness with a different reading based on the context in which it’s displayed—the supernatural, the artist as shaman or medium, the monochrome, the void, minimalism, or the connection between the paranormal and conceptualism. Given the artist’s reluctance to make absolute statements in favor of open interpretation, these readings could be all accurate, or at least applicable. “Make me up as you wish,” he once proclaimed during an interview.

Dazzle

‘To dazzle by absence’ is a Dutch expression. rel: Stanley Brouwn

Amun

The ancient Egyptian deity whose name meant something like “the hidden one” or “invisible.”

Amun acquired national importance, expressed in his fusion with the Sun god, Ra, as Amun-Ra (alternatively spelled Amon-Ra or Amun-Re). On his own, he was also thought to be the king of the gods.

His image was painted blue to denote invisibility. Symbolically, invisibility was represented by the color blue, since it was the color of the sky, seen through the air, and so this was the color usually given to Amun’s image. This attribute lead to the popular belief of his knowledge and impartiality, making him the god of those who felt oppressed.