Xkcd's mindboggling April Fools comic (reddit.com)

LOL I'm using gogo inflight and it gave me a comic about Chicago.. Seems a couple dynamic frames or static based on geoip?

The thread on xkcd forums has screenshots of a lot of the different comics. It's crazy how many variations there are. The one in hebrew (for those in Israel) makes me think people will be finding new ones for quite a while.

http://forums.xkcd.com/viewtopic.php?f=7&t=82442&sta...

It's quite an impressive effort. Works on user-agent, referer, or geolocation (or possibly a mix)

The amount of preparation work that must have gone into this is admirable. There are so many variations!

Here's a direct link for anyone who hasn't seen the comic yet. Try it on your mobile network and on different browsers

Valid for today: http://xkcd.com/

I got the snake one, which changes as I resize the browser window. I was pleased to see somewhere along the snake was the elephant it had eaten.

I fired up Chrome's dev tools to figure out how it works.

The JS that's doing the work is at http://imgs.xkcd.com/static/waldo.js. On page load, it sends a GET request to http://umwelt.xkcd.com/story/ghenkEggov8 with params w for the browser width in pixels, h for the height and r with the referrer. The rest of the qualifiers (geoloc and browser (user-agent)) can be determined on the server-side.

As a response, you get back JSON with the alt-text, image URL, and positioning info, which is then used to fetch and position the image.

Fun fact: the server-side is written in Haskell:

  $ wget -S http://umwelt.xkcd.com/story/ghenkEggov8
  --2012-04-01 11:26:41--      http://umwelt.xkcd.com/story/ghenkEggov8
  Resolving umwelt.xkcd.com... 208.118.225.100
  Connecting to umwelt.xkcd.com|208.118.225.100|:80...  connected.
  HTTP request sent, awaiting response... 
    HTTP/1.1 200 OK
    Server: Warp/1.1.0.1
    Content-Type: application/javascript
    Access-Control-Allow-Origin: *
    Transfer-Encoding: chunked
    Connection: close

http://hackage.haskell.org/package/warp/

Well done Randall and davean.

Is the IE9 version supposed to be a light at the end of a tunnel?

It's fantastic, and I enjoyed the different combinations. But I don't really get the one I get, the white disk on black thing. White light at the end of the tunnel? The alt-text doesn't really help me, either.

This guy's dedication continues to astound me.

Apparently he's still changing things - people who complain on the forum thread have noticed a few hours later that relevant fixed have been made.

(Also, I wonder how much was done by rpm and how much by davean.)

Tried Opera and Safari on the Mac and got a broken plugin graphic with "There does not exist - nor could their ever exist - a plugin capable of displaying this content"

alt text is "Umwelt is the idea that because their senses pick up on different things, different animals in the same ecosystem actually inhabit very different worlds."

I hit it from one of our EC2 boxen and got this: https://skitch.com/constantinexvi/8q5k9/skitched-20120401-14...

And oddly, got the Jersey comic from my Dallas-based Linode https://skitch.com/constantinexvi/8q5m2/xkcd-umwelt-chromium

Reddit seems to have a near complete overview already: http://www.reddit.com/r/comics/comments/rnpiw/mindboggling_x...

My favorite most definitely is the military one: http://imgs.xkcd.com/a1panels/961f9f87076b08c0d29f9182d6e1b3...

Surprised there's no Wikipedia addition to Umwelt after today's xkcd. Or maybe there is but I just don't see it.

This should be an exhibit in a museum of modern art.

It gives people a taste of the "post-PC" world we are evolving towards. And there are some deeper stuff, too.