Eight of the most mind-bending optical illusions in art

Kelly Grovier is able to identify visuals that deceive the sight and confuse the brain,   

Troxler's Effect. 

Chubb Illusion (luminance) 

Checker Shadow Illusion (contrast) 

Lilac Chaser (color) 

The Poggendorff Illusion (geometric) 

LibraShepard's Tables  

Kanizsa's Triangle 

There are eight impossible objects in the Trident.