Tsk Tsk Speedometer

I really enjoyed this assessment of how a speedometer both breaks a ton of good-visualization rules, and yet is a great visualization given its purpose and context of use. I particularly liked its discussion of why you would want to change scale halfway through a visualization in this setting. Obviously, don’t break the rules until you understand them disclaimers apply, but it’s a really elegant example of how blindly following rules alone also doesn’t make good design.