the three moving blocks are:
1. lowest layer black and white which is the reference photo converted to black and white in Photoshop using 100% on all the colour channels with the default preset.
2. middle layer green, Photoshop channel mixer to set the red channel and blue channel to zero using default preset. Then set that layer to 65% opacity.
3. top layer red. Photoshop channel mixer to set the green channel and blue channel to zero using default preset. Then set that layer to 40% opacity.
Each of these layers is saved in png format to preserve transparency.
Just checking the black & white, and red, checkboxes (i.e. no green), gives a very marked demonstration of colour constancy. The greeny-blue you see is entirely in the eye, if you colour-sample the pixels by clicking on the image you'll find they are not green or blue, they are a dark brown or grey, but translucent 40 per cent, though that just lets through grey from the underlying black and white monochrome image.