Lego.
The toy of my childhood.
My brother, sister and myself are the youngest of our cousins, and ended up inheriting all their Lego.
We had a whole verandah (grew up in Australia in the country) filled with our Lego city.
It became all encompassing.
We had no close neighbors(nearest was 6 km away) and no console until the n64 was old so it was Lego or helping Dad on the farm.
We had the most detailed alternate reality you could imagine.
Characters, occupations, a little economy (each of us had a primary character . And then all their accessory characters, and we would have a million dollars... Learned a lot about closed economies from that little experiment!) We made cheque books with little bits of carbon paper, and would reconcile the transactions.
We would start a 6 month long session by determining the rules- is space allowed? Western? Only one character? Combine with the train set for transport?) And then play out until our 'dump' of all the remaining pieces was left with nothing but the rejects... Then tear down our civilisation, rub of the chalk Marks from the floorboards that laid out the streets (we only had for pieces of road and they were all corners!)
I dislike that Lego only comes in kits now... The glory of Lego was in getting a massive rub of pieces and doing whatever you dreamt up out of it.
We had a Lego police station and helicopter and a restraint, and they were great centerpieces, but the beauty of our playtime was that it was a creative effort of the the of us.
Through out we learned/discovered economics, banking, made mini newspapers, the rules of society... I ever created my first computer program in vb so we could do our bank statements on it.
So much love for Lego.
Maybe Minecraft fills a similar role in today's kids?