I was running a focus group a while back with teenage kids.

The group tends to consist of 7 or 8 children.

You'll be aware of the tendency of the young (sorry, some young) to struggle to sit still and concentrate.

This group had been (I'd thought) particularly quiet and attentive.

But as I herded them all out of the room at the end of the session, I found this discarded on the table.

Clearly, one industrious soul had been quietly and attentively attending to his own particular project.

Portrait of the moderator, perhaps?