Optical Illusion

I have embarrassedly resorted to an app for this interpretation.  Can I use the excuse working from 7:30 to 4 today and out of the house by 6:45 a.m. and back at 5 pm and little time for preparation?  I'm pretty good at execution but not as much so with the ideas.  Anyway, it was fun playing around with the effect. 

Many thanks to Marlieske for hosting this very challenging challenge.