3 screens, 4 screens - Why Are We Counting Screens?

People have been talking about a "3 screens world" for a while now: the TV, the mobile phone and the PC. Now that media phones are sprouting around us, they are being touted as the 4^th screen. Should we continue to count the screens around us?

We live in a world of gadgets. Every other item we purchase today has a microprocessor built-in, capable of more than what personal computers were able to do a decade ago. Some, many, of these items already have screens on them. And a lot of them are either supporting WiFi or will support in the next couple of years. So why stick with an "n screen" paradigm, when a lot of our "stuff" is going to be connected and have a screen pretty soon?

Think I'm exaggerating?  Take a look at this faucet:

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This may be your 5^th screen...