I am wondering if it is possible to map all 16^6 colors from a normal 3D mapping (whether it be rgb or hsl) onto just a 2D space. Where the only variables are x,y and "similar" looking colors are all near eachother. Here is an example of a 2D sort of mapping of all the colors: (google "16 million colors" it comes up second) I'm wondering if its possible to do that but somehow get all the similar looking colors near one another so maybe like it could be split up like ROYGBIV where all the "reds" are together and so on. Of course it could not be perfect by any means but something along those lines i'm wondering if its possible. Thanks for the help guys, and I know this is a very different question so it's ok if noone is sure.