You were Saying ...
What you're seeing is a 4D cube casting a 3D shadow. To itself the 'shadow' is real and unaware of the 4D cube around it. It can only 'see' itself in three dimensions. Serves as a perfect metaphor for awareness of thought (and its limitations), the allegory of Plato's cave - http://goo.gl/By8x
(for the more philosophically inclined), a reminder of Abbot's Flatland
), a warning as to how insufficiently far our mental ability can get us. Or a cheap party trick :)
Just because it's summertime there's no reason to give your brain a vacation. Have a great 1st of July. #awesomescience