It began with some normal creativity...

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I said magnets.  He said computer.

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I said blocks.  He said nest.

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I said baby walker.  He said sawmill.

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 I said fire engine.  He said fishing pole. 

 (Maybe I should be giving him longpointythings aka sticks?)

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 I said trash truck.  He said boat oar.

Why bother with representational toys at all?