Today's Google Doodle honors the birthday of Hermann Rorschach, Swiss psychoanalyst famous for developing the Rorschach inkblot test.

The test is simple: individuals are shown ten inkblots, and are asked to described what they see in them. Used to detect a person's personality characteristics and emotional stability, it was very widely used in the 1960s. It is still used by psychologists today, but to a lesser extent.
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The Doodle on Google's homepage today offers a combination of randomly generated inkblots and ones that obviously represent an object or a figure, such as lizards, cats or garden gnomes. You can scroll through as many inkblots as you like and share what you see on Google+, Facebook and Twitter.
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Image: Hulton Archive/Getty Images, Google
Each package gets larger with a mouse-over, and a click on it returns search results pertinent to a specific country or the particular items featured in a scene. This one is from December 24, 2010.
The Google Doodle team stars in an homage to the silent film era's greatest star's 122nd birthday, April 15, 2011.
This one's done in HTML5 and was published Sept. 7, 2010. To get the full effect, here's one you can interact with.
This Doodle commemorated John Lennon's 70th birthday in October 2010.
Debuting May 10, 2011, this Google Doodle marks dance choreographer Martha Graham's birthday.
Commemorated the birthday of the inventor of the Bunsen burner, German chemist Robert Bunsen on March 31, 2011.
The great inventor's birthday was honored on February 11, 2011.
Marking Independence Day 2010.
A real crowd pleaser was this playable Pac-Man game, which appeared on May 21. 2010. Here's a playable version.