I don't know but it's fantastic what parts Lego now has. When I was young it was just different size square and oblong bricks, the flat piece to build on, some other flat pieces to make a roof with, some windows, some trees and some little round bricks. That's all I remember anyway. We had a big wooden compartmentalised box that had them all in. The rule of playing with it was everything had to go back in the right place. Argh! My great nephew has it now so only about 50 years old. Not bad.