In Game of Thrones / ASOIAF, what's Littlefinger up to? Why is he so creepy with Sansa Stark? And what does "chaos is a ladder" mean?

This video contains spoilers for Seasons 1-4 / Books 1-3. Basically, you can watch this video without having anything spoiled if you've watched Seasons 1-4 or read Books 1-3.

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Created with Toon Boom Studio 8.1, a Wacom Intuos Pen Tablet, and a Blue Yeti microphone.
Game of Thrones images and video are the property of their respective owners. Pretty sure this counts as free use.

Westeros map based on "Westeros-with borders-30pcnt.png" by Arbor / Happy End http://awoiaf.westeros.org/index.php/....

Thanks to +Cinescrat4d for the German captions, and +Maximiliano Blitzkrieg for the Spanish captions.

Errata:
0:35 The Baelish seat is located on the shortest of the Fingers, not the bit of land that the arrow is pointing at
1:41 It's actually questionable whether King Robert really is responsible for the indebtedness of the Crown