Find a hologram on a credit card or obtain one from your instructor and examine it closely.
a. As you move your head from side to side, can you see different features of the object? Is the image that you see clearly three-dimensional?
b. Move your head up and down as you observe the hologram. Do the colors change? What sequence of colors do you observe? Is there any three-dimensional character to the hologram in the vertical (up-and-down) direction?