Enigma in linea «Chocolate cake»

once again I will explain for the moderators. So-called you "turbidity" is a special effect used by the photographer. Professional photographers very often use this effect to do this, there are even special programs. Recommend googling "the background blur in the photo".
the side (from YAP. ?? Boke — "blur", "blurred") is a term which appeared in the Russian language in the late 1990-ies and describe the subjective artistic merit of the image were not in focus in the photograph. In many images the background is blurred intentionally by the photographer, to visually emphasize the main subject.

Similar puzzle:
https://en.grandgames.net/puzzle/online/shokoladnij_tort_3