The Terrace by David Macdonald
The Terrace by David Macdonald is an illusion that you may very well have seen before. Even so, this is an illusion worth another look (or two). This image is his most popular creation and has appeared numerous places around the Internet as well as in books and calendars. Looking at this image leads to confusion. The top and bottom halves do not seem to go together. Something is off. Which way is up and which way is down?