Four-year-old Teddy solves interesting problems that occur while building a ramp. Notice how Teddy’s sense of symmetrical design both helps and hinders him in making a functional ramp. Watch how Teddy overcomes his habit of aligning blocks so that he can make a working ramp by stacking blocks. See how the action of the small car causes Teddy to compare the difference between balanced design and functional form. When his symmetrical bridge does not work, he makes it asymmetrical so the car will roll down to the lower side.

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