Experiment: Concentration, and Consciousness.
Hands on thighs, feet flat on ground, back straight. This is your meditation pose. Take deep breaths until relaxed.
Have in front of you a lit candle. As soon as you are very relaxed concentrate your gaze on the flame. Avoid blinking your eyes. Stay with this concentration until you perceive the aura of the flame. It should take the form of a whitish halo around the luminous zone. It may be perceptible around the upper part of the candle
While you have the aura perceptible continue your concentration while mentally saying red, red, red until it seems red to you. After a short pause do the same with the colors orange, yellow green, blue, indigo and violet. Each time repeat the colors name until you can see it.
Meditate on the question, did I see the color I wanted to because the aura of the flame actually took this color or was it only there in my consciousness?
This is called "The Flaming Rose" and is very important. You are working on your concentration and I will explain later the answer to the question.
Have a good day, much love your way.