Marie's Optical Illusions Block 2

 I decided to do an Optical Illusion theme because I have been interested in optical illusions for a long time and I wanted a challenge.  Well, believe me, this block gave me a challenge.  I had fun with it, but it took a lot of thinking, measuring, planning, etc.  The perfectionist in me told me to do it over because it isn't perfect, but the tired person in me told me that it is o.k. and I chose to listen to the tired person.

You may notice (well, you will now) that my first block has a black border around it.  It wasn't in the first picture I posted.  I want the optical illusions that I build to float on the black background and so I was going to make each block and leave off the border then add it as a sashing between the blocks so that I didn't have so many seams.  It seemed like a good idea until I made the second block, and realized that in some cases this plan wouldn't work; so I'm going to border all of my blocks then sew them together.  I guess the extra seams will serve as a guide when I'm quilting--or something like that.