The dots are the same color
Trust what you see
The human optical system is remarkably adaptive. Your brain compensates color toward a white balance. If there is a lot of blue in your field of view, your brain counterbalances this by adding the opposite color. As a result, the dot in the purple area appears greyer than it actually is.
That dot could be your calibrated monitor. It is why skin tones look unhealthy in your renders or prints, and why colors shift between sessions without explanation.
Whether you work with film, video, photography, or graphic design: only when you perceive color accurately will you deliver your best work. A neutral grey working environment takes your work to the next level.
Why not
Mix it yourself?
You cannot simply have middle grey paint mixed at a hardware store. You may find a shade of neutral grey that comes close, but getting that exact color onto the wall is another matter entirely. Mixing methods are not accurate enough, the margin of error of the mixing machine is too wide, and no allowance is made for variations in the base paint. Base paint is never completely white and can vary in color from one production batch to the next, from one pallet to the next, or from one can to another. Hardware stores do not adjust their formulas to account for different types of base paint.
The base paint we use for Grey Paint is the whitest and most consistent available, and is therefore largely free from variation. Every batch is retested for accuracy.