Well, apologies to all concerned for taking so long to post this, but here it is. The Categorically Not! two Sundays ago was -as usual- extremely enjoyable and informative. This one was all about Illusion, in some sense, the theme being "Really?".
We started out with a few opening remarks by Bob Miller, who specialises in what some might call "light art". He's well known for creating a large number of wonderful works using light and shadow, several of them forming the cornerstone of exhibitions in the Exploratorium in San Francisco, for example. Have a look at the "lightwalk", linked here.
Bob did not talk much, because he wanted everyone to just play, learning from getting involved. And play they did. He'd been up all night preparing (with KC Cole's help) various fun things for people to do (see the table in the picture above, for example). All simple, and ...