question on feeling colors

[sergeant_lucifer101]

on days 26-28 of the spiritual warfare training program it gives these
directions on sensing colors

(((((((Take three brightly colored objects. All must have the same
texture and feel, but must be different colors. Take each one at a
time in your hand and feel it. Close your eyes and feel it some more.

Visualize the color while you hold and run your fingers over the
object in your hands. Say to yourself in your mind:
"This is how the color (name of color) feels and I will recognize the
color_____ when I feel it in the future."

The more you do this exercise, you will soon be able to feel each
color as distinct and separate. It is important to be sensitive enough
when working with energy to sense different colors. This will also
help with invoking and evoking them and in seeing auras)))))))

my question is why would you have the three objects be the same
texture? wouldn't you want them to be a different texture so that you
would be able to feel a difference in the color in accordance to the
texture? my concern is that you use the three different colors with
the same texture to learn how to feel them separately and you end up
not being able to feel the difference because they all three feel the
same.