The more primitive part of our visual cortex, which sees light contrast and motion, but not color, will blend two differently colored areas together if they have the same luminance.
Qisma seretayîtir ya ya navenda dîtina me, ya ku ferqa rengan û hereketê dibîne lêbelê rengan nabîne, eger ku xwedî heman roniyê bin, her du qadên cudareng tev dide.