Where Kinetica's coloured lines overlap, their light adds together and shines brighter — light piles up instead of blocking it out. That additive mixing is why the busiest knots of the trail seem to glow, and it is exactly how a screen makes its colours.
Look at the brightest knots in the weave: those are the busiest crossings, where the light of many lines has added together. Light piles up instead of blocking, the same way red, green, and blue light build toward white on a screen. (This is an in-the-picture lighting effect, not the disc's motion.)
Light is additive. When two beams of light fall on the same spot, their brightnesses add, making it lighter, not darker — the opposite of mixing paints, where each pigment subtracts colours and the mix gets darker. Add the three light primaries — red, green, and blue — and you build toward white. Where Kinetica's coloured lines cross, their light adds and the spot glows brighter.
Light from different sources simply piles up: the more light arriving at a point, the brighter it looks. This is superposition. Adding red, green, and blue light at full strength gives white; adding pairs gives cyan, magenta, and yellow. Paints work the reverse way — each absorbs some colours, so mixing them removes light and darkens toward black. That is why coloured lights and coloured paints mix to opposite results.
Each trail is drawn as light added onto the dark canvas, so where many lines cross, the light accumulates and those regions shine the brightest. Nothing is blocking or covering anything; the brightness simply sums. The glowing knots in the woven picture are the busiest crossings, where the most light has piled up. It is an in-the-picture lighting effect, not part of how the disc moves.
Additive colour clicks the instant you overlap beams of light and watch them brighten — three primaries piling up into white, not darkening into black.
Light adds where it overlaps: red and green make yellow, red and blue make magenta, green and blue make cyan, and all three together make white.
Every phone and television screen makes its colours by adding tiny red, green, and blue lights. Look very closely and you can see the trio; from a distance they blend, and at full strength all three together give the white of this page.
Theatre lighting designers overlap coloured spotlights to build new colours and brighter washes. Because the lights add, crossing two beams makes the stage brighter, not darker — the same additive rule Kinetica uses for its glowing crossings.
Mix red, green, and blue paint and you get a muddy near-black, because each pigment subtracts light. Paints, inks, and filters work by taking colours away, which is why mixing them darkens — the exact reverse of mixing beams of light.
Kinetica's trails glow at their busiest crossings because light adds. This FAQ explains additive colour, why it is the opposite of mixing paints, how red, green, and blue light build to white, and where the rule shows up from screens to stage lights.
Because light adds. Each trail is drawn as light laid onto a dark canvas, so wherever lines overlap, their brightnesses pile up and the spot shines brighter. Nothing is covering or blocking anything; the light simply sums. The busiest knots in the woven picture, where the most lines cross, gather the most light and so glow the most. It is the same additive rule that makes a screen brighten where colours combine.
Additive colour mixing is what happens when you combine colours of light: their brightnesses add together, making the result lighter. Shine two beams on the same spot and it gets brighter than either alone. Add the three light primaries — red, green, and blue — at full strength and you get white. This is the kind of mixing used by screens, stage lights, and Kinetica's glowing trails.
| Property | Light (additive) | Paint (subtractive) |
|---|---|---|
| Mixing does | Adds brightness | Removes light |
| Result of mixing | Lighter | Darker |
| All three give | White | Near-black |
The primary colours of light are red, green, and blue. By adding these three in different amounts you can make almost any colour, and at full strength all three together make white. They are different from the primary colours of paint, because light mixes by adding while paint mixes by subtracting. Screens, which make colour from light, are built entirely around the red, green, and blue primaries.
Because white light is simply all the colours of light added together, and red, green, and blue between them stimulate the eye across the whole visible range. Our eyes have three kinds of colour sensor, tuned roughly to red, green, and blue, so lighting all three fully makes the eye register the same response as full daylight — which we see as white. Adding the three primaries therefore builds up to white.
Superposition is the idea that when light from different sources arrives at the same place, the effects add together. For brightness, this means the light levels simply sum, so overlapping beams make a brighter patch. It is the principle behind the glow at Kinetica's crossings and behind every screen: lights laid over one another do not hide each other but combine, building up colour and brightness where they meet.
A screen is covered in tiny pixels, each made of a red, a green, and a blue sub-light. By brightening these three in different amounts, a pixel can add light to show any colour: red and green together for yellow, all three for white, all off for black. From a normal distance the trio blends into a single colour. So every image you see on a phone or television is additive colour mixing, millions of times over.
Adding the light primaries in pairs gives the secondary colours of light. Red and green light add to yellow, red and blue add to magenta, and green and blue add to cyan. Each secondary is brighter than the single primaries that make it, because it is more light added together. These three secondaries — cyan, magenta, and yellow — sit between the primaries and round out the additive colour wheel.
Yes, up to the point of full brightness. Each beam you add raises the total light, so more overlapping beams glow brighter. Once the light reaches the maximum a screen or eye can register, it saturates at white and cannot get any brighter, even if more light arrives. Below that ceiling, though, brightness simply keeps adding, which is exactly why Kinetica's most crowded crossings are its brightest.
It is a drawing choice, which is why Kinetica labels it honestly as in the picture rather than real physics. Drawing each trail as added light makes the crossings glow, but it does not change how the disc moves, bounces, or spins. Keeping that distinction clear matters: some of what you see comes from the simulated physics, while other parts, like this additive glow, are simply choices about how to light and draw the picture.
Because each paint works by absorbing — subtracting — some colours of light and reflecting the rest. A red paint absorbs most colours and reflects red; a blue paint reflects blue. Mix them and between them they absorb almost everything, leaving little light to reflect, so the mixture looks dark and muddy. The more pigments you combine, the more light is taken away, which is the exact opposite of adding beams of light.
No, they use opposite systems. Screens make colour by adding light, using red, green, and blue, because they emit light. Printers make colour by subtracting light, using cyan, magenta, and yellow inks (plus black), because ink sits on white paper and absorbs colours from the light that falls on it. So a screen builds an image by adding glow, while a print builds one by taking colours away — additive versus subtractive.
Everywhere there is a screen or a coloured light. Phones, televisions, monitors, and digital billboards all make their pictures by adding red, green, and blue. Stage and concert lighting overlaps coloured beams to paint scenes and brighten them. Even the way our own eyes combine the signals from three kinds of colour sensor is additive. Once you know to look, the adding of light is all around you.
Drawing trails as added light gives the picture depth and life: the path's busiest, most revisited regions naturally shine the brightest, so the eye is drawn to where the most is happening. It also keeps colours vivid where they overlap instead of muddying them, the way paint would. The glow is an honest in-the-picture flourish that turns a tangle of coloured lines into something that looks luminous and alive.
They are two sides of the same coin. Dispersion splits white light into its colours, showing that white is made of many colours together; additive mixing runs the process backwards, combining colours of light to rebuild brightness and white. Both rest on the fact that white light is a sum of colours. Kinetica's glowing crossings add colours up, while a prism, in its dispersion article, fans them back apart.
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