97/366 Lego concentration
I am of the opinion that Legos are the best toy investment you can make. We have purchased several new sets of Lego Duplos, as well as picked up a bunch more from yard sales, and our kids have more consistently played with those than with any other of their toys. I love watching how the kids start with really simple forms, and then transition to building for utility (e.g. a house for the Lego people).
Concentration