Astro‘s street art style is easy to recognize in the streets. He creates giant murals with complex patterns and optical illusions that make it look like the building is empty on the inside. The first picture you see in this post is a building wall designed by the French street artist in Loures, Portugal. The others are examples of his fantastic work, taken in other places.

Source: Street art optical illusions by Astro – Designer Daily: graphic and web design blog