Optical Illusion - work in progress

I've been trying to find time this month to try Nienke's Optical Illusion technique, and finally got some fabric dyed yesterday.  I didn't take any pictures of the 4 squares, but I just finished fusing two of  the merged squares onto my background:

I didn't mean to use such similar colors to Nienke's example, but I had the dyes mixed for another project and decided to use them here as well.  So far, I'm really enjoying how this is coming out!  I hope to get the stitching done today, and then get a start on the next step tomorrow.  I may not be done before the end of the month, but I'll post again just to let you know how I'm doing.  I already know I want to do some more with this technique... very interesting!  Thanks for the tutorial, Nienke!