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Many, if not most, kids naturally have the "bus ticket collector's" obsessiveness (http://paulgraham.com/genius.html ). Maybe it's just a question of not losing it as you get older.pic.twitter.com/OfM3asazsS
I realize that's nontrivial. It's not simply a matter of remaining obsessed with the things that obsessed you at age four. But there might be something that can be conserved. And it means that many of us already know what this good kind of obsession feels like.
He’s going to love building the bigger technic sets as he gets older! 
I'm not sure I agree with this. While there are children with this obsessiveness, they tend to be on the spectrum. It isn't a generalized trait.
If you saw that your kid had this disinterested obsessiveness in something, would you try to nudge it towards something that matters? What if external nudging turns off the obsessiveness?
Adam Savage comes to mind 
I kept a rock collection in an old shoe box. If a rock was interesting, into the box it went. The big one was a 6 lb quartz I dug out of the street as a 5 year old. Another was two halves of the same rock found separately on a trail. Maybe it’s a sort of journal.
4.5 lbs actually*
How does an adult who has lost this kind of obsessiveness get it back? Is it even possible?
Good question, I think "we can't"... but if @paulg finds out, he'll give us an essay about it.
The shelf seems to have lot of books around airlines, airports as well. Hope his obsessions lead him to build a company similar to Boom someday.
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