It's known as the "Trompe l'oeil" technique. That is French for -I believe -"trick the eye". Yes it involves careful addition of shadows, but also a clever use of perspective.
There's a bit of info. about that painting style here:
https://en.wikipedia.org/wiki/Trompe-l'%C5%93il
[Apologies for the link not working at the moment. Our engineers are working on the website. Things should be back to normal as soon as possible.]
For anyone interested, google "Trompe l'oeil" and there will be some sites with info about that style.
I must say it is one of the most exciting painting styles I have seen. Many street artists use this style, and their work is always a joy to behold! It takes a good grounding in basic artwork skills to pull it off though.
There's a bit of info. about that painting style here:
https://en.wikipedia.org/wiki/Trompe-l'%C5%93il
[Apologies for the link not working at the moment. Our engineers are working on the website. Things should be back to normal as soon as possible.]
For anyone interested, google "Trompe l'oeil" and there will be some sites with info about that style.
I must say it is one of the most exciting painting styles I have seen. Many street artists use this style, and their work is always a joy to behold! It takes a good grounding in basic artwork skills to pull it off though.