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The 3D UCT Octahedron (Colourhedron) illustrated in 2 dimensions
6 Colour Primaries
at the 6 vertices
3 Vivid Primaries
Top Right Face
(AKA Positive face)
C - Cyan
Vivid Blue
G - Green
Vivid Yellow
M - Magenta
Vivid Red
3 Rich Primaries
Bottom Left Face
(AKA Negative face)
B - Blue
Rich Blue
Y - Yellow
Rich Yellow
R - Red
Rich Red
Note: Directions are relative to the diagram as the model in reality could be rotated any direction
Chrome (WSK)
1 Non-colour - Zero Point
With 3 potential states
A single "non-colour" at the centre of the Colourhedron with 3 potential reflective or subtractive states. All colours arise & return to this point through addition or subtraction
W = white
all additive colours
S = Silver (Grey)
K & W + W & K
balanced
K = black
all subtractive colours
Chrome Notes:This can also be thought of as a shiny silver/chrome ball as it makes it easy to imagine that it is reflecting & projecting white, absorbing black & all the grey/silver shades & tints in between“S” (Silver) is used for grey to not confuse with G for green & also represent the S line that delineates the black & white on a spherical yin yang symbol ☯️ that's used to represent the Non-colourImagine that 3 colours from any 1 external face on the Colourhedron were to project inwards towards the center, they would combine to white if from a top additive face, or black if from a bottom subtractive face or cancel each other out if all colours were projecting from all faces at onceNow repeat the same process in reverse, where the non-colour separates into black & white then each of those separate out into the 6 primary colours & it's possible to see how a "no - thing / non-colour" can give rise to all the colours & phenomena in the universe. This is a simplified explanation for part of the basis for Phen Theory
3 Generations
of Mirrored colour Pairs
C ⇄ B
Cool pair
Vivid & Rich Blue
G ⇅ Y
Bright pair
Vivid & Rich Yellow
M ⇄ R
Warm pair
Vivid & Rich Red
UCT proposes that colours are separated not just by the 2D warm & cool, but in 3D they are also transitioned or mediated by a third property, what UCT calls Bright (or Bright Pair or Bright Generation). This distinction dramatically changes our perception of the Yellow / Green band of colour & its transitional roll as the mediator between warm & cool. This can been seen physically by the fact that green yellow is actually the transitional peak sensitivity of human visual colour spectrum (560nm or 180ºS)
Generation Notes:Another way to think of the colour pairs is as positive & negative versions of the same colour eg. Yellow & Green in the Colourhedron can be more easily visualised if you think of the G not as green but as a vivid (Neon) or cool yellow as other colour pairs BC & RM are easier to visualise as matching pairs2 Pyramids
Square based of 5 colours
(Additive & Subtractive)
Mapping of Colourhedron Halves
In the same way we can divide the Colourhedron into Top & Bottom (Additive & Subtractive), we are also able to divide the Colourhedron into Left & Right (Rich & Vivid). Effectively dividing the UCT Colourhedron into 2 vertical halves, "Left" side being Rich & the "Right" Vivid, displaying yet more symmetry to the model
Additive ⇅ Subtractive
Mirrored Top ⇅ Bottom
RGB & CGM ⇅ BYR & CYM
Rich ⇄ Vivid
Mirrored Left ⇄ Right
RGB & BYR ⇄ CGM & CYM
11 Planes
8 External Faces +
3 Internal Planes
8 External Planes
Triangular faces of 3 colour primaries
(Also known as colour spaces)
Top Additive Pyramid
4 Colour Spaces
Colours mix to produce white at the centre of each triangular face or towards the centre of the Colourhedron
CGM
(Light/Neon)
Vivid & Wide
BGR
(Digital/Screens)
Rich & Narrow
MGB
Transition/Blending
RGC
Transition/Blending
Bottom Subtractive Pyramid
4 Colour Spaces
Colours mix to produce black at the centre of each triangular face or towards the centre of the Colourhedron
BYR
(Paint/Traditional)
Rich & Narrow
CYM
(Print/Modern)
Vivid & Wide
RYC
Transition/Blending
MYB
Transition/Blending
Faces / Spaces Notes:Names in brackets are to identify various colour spaces & their usual best uses eg. Digital, Light, Paint & Print. Some letters are rearranged from the traditional order eg. RGB becomes BGR based on reading each dimension from left to right. “Vivid & wide” & “Rich & Narrow” is a simple descriptor of the planes colour gamuts. But the "non standard" Transition/Blending face dimensions of MGB, RGC, RYC & MYB havent been described yet as their mixture of Rich & Vivid, Wide & Narrow gamuts within 1 mixing space makes them inconsistent for practical use but form planes that blend or transition from vivid to rich across the front & rear of the Colourhedron & are part of the full colour spectrum
3 Internal Planes
Square planes of 4 colour primaries
(Also known as secondary planes)
BMCR
Plum Plane
(Left, Right, Front, Back)
RGMY
Orange Plane
(Up, Down, Front, Back)
YBGC
Lime Plane
(Left, Right, Up, Down)
Mechanics & functional use descriptions of the basic model are yet to come. Until then, I invite you to explore how you can use the model in your own practice
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