Black or Blue

Last night I was looking for a black shirt in my suitcase. I wear a lot of black so I kept pulling out the wrong black one. Where is it? Please tell me I didn't leave it at home. I ransacked any order my packing had produced.
Finally I found it.
It was blue. Not black. Not even dark blue. I had changed my mind at the last minute and put in the light blue one.

How often am I chasing something that's not there? How often am I missing what is right in front of my face?