I apparently am lacking in imagination. It never occurred to me that all my childhood construction sets: Lego, Lincoln Log, Tinker Toys should work together. So my mind was completely blown when I saw this:
Ever wanted to connect your Legos and Tinkertoys together? Now you can — and much more. Announcing the Free Universal Construction Kit: a set of adapters for complete interoperability between 10 popular construction toys.
I mean wow, just wow.