Turn on the radio as you drive to the supermarket. A disc jockey is playing a song 50 miles away. The music fills your car. These are two examples where one object can influence another object at a distance. Through the influence of waves traveling through an underlying field.
Water links the two corks, and the electromagnetic field links the radio station and the car radio.
The Behavior of Fields One interesting characteristic about the behavior of fields is the manner in which waves travel through them. For example, consider the ordinary light radiating from your reading lamp. It is the product of innumerable light waves that are random and incoherent in their pattern. Take any 100 of these incoherent light waves and they produce the light of 100 separate waves. Because of this the light from your lamp is bright enough for you to read the book in your lap, but not nearly bright enough, say, to reach the moon.