It began with IBM, it continues with Lenovo. Today marks the 20th anniversary of the venerable ThinkPad lineup of computers. Lenovo is celebrating with a mish-mash of nostalgic press releases, including some material from the ThinkPad's induction to the MoMA earlier this year.

The classic design, inspired by the Japanese bento box, is known for its distinctive matte black case, red pointing nub, excellent keyboard and off-kilter badge that announces its name. These days, the ThinkPad line has expanded to new operating systems, dual-screen designs and best-in-class Ultrabooks.

At the MoMA event, Lenovo's VP of Corporate Identity and Design, David Hill shared a booklet called ThinkPad Design: Spirit & Essence. It was a limited run, but Lenovo has posted an online version of it here, and it is gorgeous as it is self-congratulatory.

Below, Lenovo has a video detailing the early history of the line, and, below that, a graphic detailing ThinkPad milestones.

Lenovo, via ZDNet