Pay attention, 2014 Mad Men: This little girl is holding a LEGO set. The LEGOs are not pink or "made for girls." She isn't even wearing pink. The copy is about "younger children" who "build for fun." Not just "girls" who build. ALL KIDS.

In an age when little girls and boys are treated as though they are two entirely different species by toy marketers, this 1981 ad for LEGO -- one of our favorite images ever -- issues an important reminder.

To contrast, here's an image of a LEGO Friends set -- a line made specifically for girls that has been scrutinized since its launch in 2011:

The advertisements for LEGO Friends, too, are noticeably more feminized than their 1981 counterpart.