Download or read book Supervisions written by Al Seckel and published by Sterling Publishing Company, Inc.. This book was released on 2006 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: These amazing artistic optical illusions have real depth - that's because they're in 3D! Some have to be viewed through a pair of red & blue paper glasses, which come with the book: put them on & watch decorative cubes, towers, & other complex geometric drawings spring to life, gaining volume & space.