I love occasionally blowing my brain up and nothing does it quite like when I see something that looks real but is actually a perfect photorealistic drawing. Take this glass of water, it’s drawn with such skill and shading and angling and plays on your perspective so well that I feel like I can reach out and take a sip.
Done by PortraitPainter Pabst, you can watch him draw the 3D glass below.
source: gizmodo.com by Casey Chan
The Fat Cat Collective 
This optical illusion totally blew my mind too. Amazing drawing skills.