There was once a category of toys we called airport toys. Most often a character of some sort would roll down an inclined track, be mechanically picked up at the bottom and returned to the top of the track to roll down once more. These toys had no interaction, only a switch to turn them on so that you might watch them cycle over and over. These were truly 'watch me' toys, and I don’t see them in the airports much anymore.
If constant hands-on interaction makes for a great toy, are there other types of interaction with a toy that are not so manual that make that toy great?