Huge mistake - It's cost me Wood, time & Effort.

It happens.. Too many things going on and you (I) didn't do a layout 'sense check'

If I had, I would have spotted the problem. This hasn't happened before because I was making one or two seats at a time. Three.. a step too far and I changed the process, without adding a check or checklist. 

But the optical illusion part really surprised me. At first I was so stumped it was unreal. 

What the video and see just what I did. 

watch it now