Can't get more low-tech and high impact than Legos. Not specific models, the big...

auganov · on Aug 4, 2013

I second that. Or wooden blocks like http://www.bizchair.com/0259jc-jon.html?utm_source=amazon.co... These were the only thing I liked about pre-school.

I think you should balance between open-ended toys and more focused ones. These circuit toys some other people posted - I always hated stuff like that. I still do when I look at it. Just feels so limited.