photo credit: Philip Greenspun; image source
This photo (hi-res version) shows the Great Sand Dunes National Monument in Mosca, Colorado. To learn more about sand dunes, visit this Wikipedia entry. Also, to see sand dunes form indoors, check out this Exploratorium exhibit.
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PhET: The Moving Man
Once you have clicked on the "simulation" link below, be sure to read the Java Security Advisory before running the simulation: To do that, click the "Read now" button on the yellow band near the top of the PhET page.
If you'd like to learn about motion, try PhET: The Moving Man, a PhET simulation from the University of Colorado. As you move the man back and forth, the applet generates graphs of position, velocity, and acceleration. There are nice sound effects, too.
(This feature was updated on May 5, 2013.)