color wheelHere's in interesting bit of information on how your brain interprets the real world:  There is no Magenta color in the real world.Magenta manifests itself on the wavelength boundaries of human vision.  For example when you look at a rainbow, you see the colors that range from Violet to Red and Magenta is curiously absent.A color wheel, however, is created by gradually blending colors, which is why you perceive blending red and yellow light as orange.  What is happening is your brain perceives an average of the wavelengths, which makes RGB televisions/monitor pixels so effective.If you look at the visible color spectrum, you will notice Violet and Red are on opposite sides of the scale:

visible spectrum

So, when the color wheel gradually blends the Violet and Red color area it is basically bending the visible color spectrum and connecting the ends; the result is Magenta.  Instead of averaging the wavelengths into the expected Green, your brain experiences Magenta while trying to make sense of the edges of visual perception.What could be a better choice for Alpha/Transparency than a non-existent color?So, look around.  You will not see the color Magenta in nature unless it is the product of a blend of Red and Violet light.Speaking of edges of visual perception, the brain does interesting tricks while compensating for limited sensory input.  The interpretation of field-of-view is also odd once you try to experience the edge of your peripheral vision.Fix your eyes on a point, then take your hand and explore the edge of your sight.  You can see your hand at one point, then you can no longer see it once it passes beyond the corner of your eye.  But where did it go?  It didn't pass into a black visual space.  But, what did it pass into?Your brain does not comprehend sight outside of the field of vision and it does not allocate visual cells for the area behind yourself.  For that we have a mental construct of the world around us.  Your hand is passing from a visual existing object to a purely conceptualized object in your mental space.Passing an object over this boundary is exciting since you almost feel a shudder as it loses all visual existence and only remains positioned in your mind.  No wonder it takes children a long time to learn people and things don't cease to exist when they are no longer visible.It makes you wonder why there isn't a Magenta equivalent in the transition between opposing edges of your field of vision...inspiration from Anne Marie Helmenstine  
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