A professor of neuroscience told the Guardian the differing experiences of the color of the shoe were due to the brain attempting to color correct, something our brains do constantly.
“The sky is blue, but everything you see under a blue sky isn’t blue. This is because your visual system is pretty darn good at figuring out what part of the light that you’re seeing is caused by the light source, and what part is caused by the surfaces themselves. We only really care about the surfaces – this is the part of the light that tells us about objects. The color of the light itself is usually pretty meaningless.” -Bevil Conway, associate professor of neuroscience at Wellesley College
The debate may already be settled, though. The shoe appears to match a Vans women’s shoe called ‘Old Skool,’ which comes in mahogany rose (pink) and true white, but not grey and teal.