Street Art in Moscow # 21

 I've found one more piece of street art I spotted on one of Moscow streets. 
 It must be the most fat milk in the world - 31 %. 
 I wonder at what time of the day street artists create their works on the canvas called #wall#? Day or night? If you have street artists friends, please, ask them and let me know. In my turn, I promise when I accidentally come across a street artists, I'll ask him too and let you know, guys.