Changing from a regular sales model to a freemium model is a risk, but it is one that mobile developers all over the world are looking at.

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Google is the acknowledged champion: its offices are blessed with volleyball courts, bicycle paths, a yellow brick road, a model dinosaur, regular games of roller hockey and several professional masseuses.

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Beatles drummer Ringo Starr and model Jerry Hall, both regular visitors to Chelsea, were also in attendance.

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It's no secret that the old scarcity model of celebrity culture--regular people only got a glimpse of famous people, which made them want to see them that much more--vanished sometime in the CompuServe era.

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Trying to open 3-0 for the second straight year, the Mets wore caps with orange bills for the first time in a regular-season game, rather than their usual model in solid royal blue.

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But no, then came the pro model, which comes out months after the regular edition, with an incompatible OS, vague words on pricing ("akin to an ARM tablet" "similar to an ultrabook"), features that don't span across the range like pen input and Office home.

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When a regular driver uses a sports car, they use their mental model of a normal car to make sure they do not crash.

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In fact, Apple introduced two new iPads this week: The fourth-generation of the regular 9.7-inch iPad, which replaces the third-generation model released back in March, and the iPad mini, a smaller-screen version (7.9-inch display).

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