It is obviously photo manipulation. What I like about the photography and graphic design are absolutely no limits! You can go as far as your mind let you. The sentence which helped me to go so far in my photography career is: Your limitation is your imagination. There are no boundaries unless you let it be.
Once I was sitting on the sofa in the living room, and I've noticed this small toy. Then I thought: "How would it look like to make it gigantic?" I didn't think long, I took my camera, tripod, a teddy bear toy and went outside. Total fun and improvisation. Why not?
10hrs later these photos happened!