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00:00:30
Are the stripes spinning . . . or are you? Exploratorium exhibit "Silage Beach," by Artist-in-Residence Mowry Baden. When a moving scene dominates your field of view, you almost always perceive yourself as moving and the scene as stationary. You assume that you must be moving because in normal, everyday life, you move through the landscape–it doesn't move past you. Come play at the Exploratorium! Now open at Pier 15 in San Francisco.

00:04:05
On the cliffs above San Francisco's Ocean Beach perches a landmark observatory—a giant camera obscura. Step inside with Robert Tacchetto and see how this centuries-old technology creates enchanting images of the outside world.

00:03:53
Join Exploratorium educator Ken Finn as he unlocks the mystery behind the black sand (a.k.a. magnetite) at Ocean Beach. This piece explores the origin of magnetite in the Sierra Nevada mountains, its journey down the Sacramento and San Joaquin rivers to the Bay, and the interesting physical properties of this mineral, plus some fun things you can do with it.