And you can't click on more than one thing. If you click on the mailbox at Tigger's house, you'll see a little animated routine. If you then click on something else, nothing happens. You've got to wait. In this instance, the little-known character gained a far greater following than the famous one, Warren says.
Human beings vote with their feet.
If you make the mistake, as a software designer, of not giving them a feeling of control, then you are violating a principle of interactivity. Warren believes user-controlled software not only is more appealing, but also teaches better. In fact, he may write a dissertation on the subject.