Where's O'Wald?

My sister has the amazing ability to glance down at a field of clover & almost instantly pick out a four-leafer. I've always wondered how she does it. Do they wave to her or something?

So in honor of Sarah, & St. Patrick of course, here's a crowd of ordinary shamrocks with one resident oddment waiting to be discovered.

Photoshop

Happy St. Patrick's Day!