Okay, technically, optical illusions are more psychology and recreational mathematics, but if there’s something to convey, design will always be a way.
Surprisingly, trying to find concrete optical illusion-based designs with a source was a challenge. Most of the time, I just ended up finding discrete sculptures like that in Tabary Francis’ works:
Okay, great, I can show you these sculptures for hours, but what’s the point. I mean really: what’s the point of optical illusions. Well, here comes the lesson of this post—design takes from all fields and subdisciplines. Design serves to convey, to give purpose, and most important, intuition for the world around us. While these structures do look purely for fun, and some definitely are, their purpose is to challenge your perceptions of the world. Challenge your top-down thinking and make sure you think twice before updating what you believe true. That’s the purpose of optical illusions in design, but they’re useful too, like serving as a monitoring and rehabilitation tool in psychiatry. In mathematics, it’s a recreational tool! They always say that different things have different meanings for different people. These topics are no different—especially optical illusions.