My personal favorite painted illusion is shown below. The only thing "real" on the table is the pencil. Seriously. This is a middle school piece! Pretty impressive, no?
I thought the elementary piece pictured below was a lot of fun, with the infinite reflection beginning with the 3-D element. This piece was huge.
Another awesome middle school level work of art, below.
Honestly, I only got to breeze through the work in the sculpture, architecture, photography, and illustration categories. And I didn't get to see the fashion creations at all, which was kind of disappointing, since they are always so amazingly incredible. Anyhow, here's a few more pics of what I did get to see.
I don't know what the challenge was, but the piece below seems to have an an Alice in Wonderland/underwater tea party sort of theme, I think?
I'll close with one more optical illusion piece with a 3-dimensional element, created by a team of high school students.
2016, 2015, 2014, and 2013.