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DENJIRO: Let me introduce to you a mysterious phenomenon using everyday items. First, I’ve brought some utility knife blades with me. Here, I have neatly stacked 100 blades. The blades are made of steel, so they have a metallic shine to them. Now, let me turn it over and show you the blade side.
GIRL: Huh? It’s completely black!
DENJIRO: It appears as if black tape was put on it. The color isn’t actually black, it’s just dark. Why does it look dark? When you stack the blades together, you get small spaces between them. This is key.
Let me explain by performing an experiment using a laser. I have two mirrors facing each other at an angle. Let’s look at them from above. Think of this as the space between the blades. Let’s shine a laser at a mirror and see how the light is reflected. You can see that the laser is reflected between the mirrors and eventually moves away from the mirrors.
Now, let’s make the space between the mirrors narrower and make the angle smaller. Watch what happens. You can see that there are more reflections between the mirrors. Now compare the brightness of the laser that leaves the mirrors. When the angle between the mirrors is reduced, the light is dimmer.
GIRL: You’re right!
DENJIRO: As the light enters the space between the mirrors and gets reflected over and over, the light becomes weaker because it gets absorbed by the mirrors. The smaller the angle, the more reflections. Therefore, the light gets weaker.
With the utility knife blades, stacking them together makes the light that enters the space between them get reflected many times, resulting in a weaker light. As a result, the light doesn’t reach our eyes, and the side with the blades looks black.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!”