Barry asked kids to affix a specially purchased transparent film to the TV screen and then follow along as he drew images on the screen. Kids could color and trace his images with specially purchased crayons that were the only ones "approved for use with Winky Dink."
Here is an excerpt from the show:
Hey, this might be the first example of interactive TV (except for the fact that the TV signal didn't carry the doodles back to the studio). On a commercial note, the "vendor lock-in" that required the purchase of "specially designed" crayons makes for a great example of early product marketing.
The idea for this post was derived from a talk by Peter Hirshberg at TED entitled "The Web and TV: a sibling rivalry."