Contextual navigation
		Here's where it gets interesting. When a user mouses over any of the category images, "contextual navigation" appears, providing related topics. Mousing over an image of I.M. Pei, for example, reveals topics such as "functional, geometric, and Modernist Architecture;" topics that might not have been outwardly apparent to a user. The varying sizes of the words communicate how relevant each topic is to the main topic. ALT tags give short instructions on how to use these images.
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