Forget about these:
I just found the perfect one. Can you explain why I think the below heatmap is perfect?
Sad Side Note: There would be a perfect xkcd title in here, but that would just completely give away the solution :/
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I agree that it's perfect!
Each of the first three heatmaps
corresponds to a keyboard layout:
The first is the well-known QWERTY layout, and the others are the Dvorak and Colemak keyboards. Each letter's color is based on its frequency in English-language usage.
(As you can see, in the second and third, the middle row is much more intense than the other two rows - this is a proposed benefit of Dvorak and Colemak, since they don't require you to move your hands off of the home row as often.)
The last one
Mr. Jock, TV quiz PhD, bags few lynx- a well-known perfect pangram!