One of my numerous colour-cube doodles—not interesting to anyone else, but I like it, and it was a relaxing project. I would call it a distraction activity, except there’s nothing I’m doing that it can be a distraction from. It’s an 18×18×18 cube, with all the RGB numbers being multiples of 15.
The top left figure is a view of the outside layer of the cube, showing all the colour cells that have 0 as one of the RGB numbers. The centre cell is #000000. The top right figure is the opposite view, showing all the colour cells that have 255 (#FF) as one of the RGB numbers, the centre cell being #FFFFFF.
The pair below them show the next layer in. The left-hand figure is all the colours in the cube with a minimum RGB number of 15 (#0F), with #0F0F0F at the centre; the right-hand one is the colours with a maximum of 240 (#F0), with #F0F0F0 at the centre.
The next pair down have a minimum of 30 (#1E) in the left-hand figure, and a maximum of 225 (#E1) in the right-hand one, the respective centres being #1E1E1E and #E1E1E1. And so on down to the smallest pair, with the minimum on the left of each pair being 15 more than that of the next bigger pair, and the maximum on the right being 15 less. The maxima and minima of the smallest pair are 120 (#78) and 135 (#87) with centres of #787878 and #878787. These are the centre 2×2×2 cube.