"Shake Your Screen" Optical Illusion refers to a fetish drawing category that grew popular on Japanese Twitter in September of 2019. The meme consists of portraying a female character with large breasts with a particular design surrounding her cleavage and an invitation for the reader to shake their phone. The design is an optical illusion that will trick the eye into de-synchronizing the movement outside the picture and the movement inside the picture, giving the illusion that the breasts are actually bouncing up and down.