Lin Chung created 3-D in the Hidden Kingdom in "Pitched Battle of the Tank Army". He made it to dazzle High Roller and make them let First Squad go. Apparently if turn the pages in a book the contain sequenctial drawings really fast while wearing special glasses a purple 3-D image will come up. Lin Chung created it by looking at the demons through some of the broken diamonds and then creating special glasses with a red and blue side that make a 3-D image pop up. This also became useful in befriending the cats in "Cat Castle". It's usually Mystique Sonia who blows the pages in his book to make the image pop up.