Brain the size of a walnut

We tend to think of Casper as the smarter of our two cats. So it was surprising how long it took him to work out he had to turn his head on its side to get it out from between the slats of a kitchen chair.
Perhaps 'work out' is overstating it.
Today's blip was going to be another gig shot, but a change of start time, a seat at the back and a Queen's Hall pillar in the way all transpired to scupper that