[tptacek]

One of the most recurrent metrics in Tufte's books is "density". Another is "comparisons on multiple axes" (I'm going from memory, I think he had a more technical term). How do you think this particular graphic does?

Graphics like this seem more like posters promoting an idea than tools for understanding complex data.

[lloeki]

Complex data relative to what? You and I can (quite) easily grasp how huge is a petabyte, an exabyte, a zettabyte even; yet someone not "in the field" will have a hard time grasping what represents such an amount of information.

Of course this one being ordered by Mozy should trigger some warnings about it being a covert ad, but it does not detract from the potential veracity of the data.

This one is admittedly quite simple, but should we discard all infographics on the merit they're not of Tufte level?

[Karunamon]

>You and I can (quite) easily grasp how huge is a petabyte, an exabyte, a zettabyte even

Can you really? I work with video every day. Terabytes are nothing when we're talking HD content and lots of it. It's still pretty hard for me to visualize, even sitting at a system with the details up in front of me, what exactly a petabyte is. Let alone hundreds of thousands of them.

It's like asking an average person to visualize a trillion dollars. There exists a point once a quantity becomes sufficiently large that you tend to stop consciously processing it.

-edit, realize this sounds really snarky, it's not. I am legitimately curious how you quantify that much stuff.

[lloeki]

I've been working on problems at various scales from subatomic to galactic scale and about everything in between. At some point, when you're genuinely interested about what you do, you build mental bridges between domains and scales and values and units, you... connect some dots. You start understanding what a log/exp is, what that "shooting through the roof" profoundly means. By understanding I mean you start feeling it with your gut. So when someone talks about one Zm I could take it as a pure value, but I could try and get the feel of it. It's overwhelming, so much so that I can physically feel the cognitive weight of it on my mind. So when I make some conversion and find that 1Zm is about 100'000 light years, and I know (whatever the light-year value means, I take it as pure, transitional value to an item of knowledge) that the Milky Way is about that size in diameter, only then do I feel the absolutely immense size of our galaxy. I must insist that it's no more the vision of the galaxy that gives weight to a Zm to me, but the Zm that gives the incredible sense of dimension of that pack of matter.

[tptacek]

Nobody is arguing that we should discard bad infographics.