Sixty-Eight!

Googling images for "68" this is what caught my eye:

It's from a 1904 German-English Primer.  Don't you just love the font? You didn't know this was a bi-lingual exchange, huh?  So now, when your setting up your studio to make your prints, and someone interrupts you to ask, "Where is the water?" you'll know how to respond in German, "In the cistern is water." or you could just answer, "I was in the circus," which will explain a lot.

Woo-hoo!  We have sixty-eight participants.