Mono Monday-optical illusion

This is a double exposure which gives the illusion that there was a hummingbird flying around in our workshop today! 
Ol' Gramps was helping Sanibel create her pinewood derby car, and I got this shot of them working together, then I layered a shot of my hummingbird sun catcher that Sanibel gave me for Christmas.   One of these days I'll take a shot of how it looks in the sunshine, but for today, black and white will do.
The real optical illusion will be Sanibel's car when it's finished.  It's a pinewood derby car made to look like a gerbil!!