Angle art is not the official name of this type of art, though I think it fits as this type of art has two different drawings based on which angle/side you look at it

Notan art is a very visually appealing form of art, the colours of the background and elements get reversed to create this beautiful effect! 

That looks amazing! I'm in awe. You did a really good job with this!

omg!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!