A designe expressing the colors of the pen in shape.

We regard the color as a physical phenomenon coming from the difference in wavelength of light and represent it as a pattern on the pen body.

In other words, the red having a long wavelength of light is represented by a pattern of long waves, and the blue having short wavelength of light is represented by a pattern of short wave. The two different patterns are applied to each pen body.

This patterns help you to distinguish a color with touch of your hand if the pens are in a bag or pencil case where you cannot look at.