A near perfect real world rendition of a common refrain
I dont understand this what do you mean? 
All those panels are the same yet due to their reflective properties, the sun position, the camera angle and a host of other factors they ‘appear’ different.
When rendering something for a client we’re often sent ‘the exact’ material they want but when it’s rendered the result is often what you see in the photo above.
Therefore we often hear “why did you make it look like that when I gave you exactly what I wanted?”
