@rdaily For me it doesn't work very well for the reds. That's just a grey background with red lines over it. The greens, yelows and blues do a much better work of letting my brain fill in. The red might be too vivid there causing a too big contrast.
@rdaily
Yup, on my phone I'm starting to see the reds as well. But at that point it means the colored squares are a lot smaller, thus it's easier to fill in the blanks that way.
If the colored squares were the same size from the phone when displayed on a big monitor, it'd fill in the blanks better too. At that point you might as well just actually color the actual photos. ;)