. . . .GOOD: What do you mean by “heirloom design?”
SAUL GRIFFITH: An object with “heirloom design” is something that will not only last through your lifetime and into the next generation, but that you also desire to keep that long because it’s beautiful, functional, and timeless. . . .
From www.good.is Read the entire article here
By the way, my daughters play with my lego from my childhood - and we continue to add new sets to it. Same goes for our first generation Fischer Price toys - just as relevant today as ever.