Impossible triangle and snake

Tattoo by thefactsandlife  

http://im-possible.info/english/art/misc/tattoo/thefactsandlife.html

The Bottle with a "Liquidity Problem"

The Bottle with a "Liquidity Problem"  

by Sandro del Prete  

http://im-possible.info/english/art/delprete/the-master-of-illusions/200.html

Wonderland

Wonderland  

by Wenquin Yan (yuumei)  

http://im-possible.info/english/art/rendered_escher/wenqing-yan.html  

Author - http://yuumei.deviantart.com/

Klein's Bottle Trap

Klein's Bottle Trap  

by Sandro del Prete  

http://im-possible.info/english/art/delprete/the-master-of-illusions/199.html

Penrose Huichol

Penrose Huichol  

by Jorge Plascencia  

http://im-possible.info/english/art/rendering/jorge-plascencia.html  

Author - https://www.behance.net/3dearts7ed2

Safety Attempt

Safety Attempt  

by Sandro del Prete  

http://im-possible.info/english/art/delprete/the-master-of-illusions/197.html

Computer art by Gnana Sai Reddy

Art by Gnana Sai Reddy  

http://im-possible.info/english/art/computer/gnana-sai-reddy.html  

Author - https://www.facebook.com/ArtWorksFORjoy/