Final answer:
Color constancy is the phenomenon that allows us to perceive the true color of an object despite variations in lighting conditions.
Step-by-step explanation:
The phenomenon described in the question is called color constancy. Color constancy refers to the ability of our eyes and brain to perceive the true color of an object regardless of varying lighting conditions. For example, when we look at grass through sunglasses, it still appears equally green because our color vision takes into account the surrounding objects and lighting conditions to determine the true color of the grass.