Visible spectrum and perceptions

In an attempt to leave aside the figurative shapes, the accumulation of colors and the symmetry, i made this series of drawing during my stay in Barcelona during 2016.
Grey
Violet
Orange
Turquoise
Red
Yellow
Green
Blue
Pink
Brown
Frequency
Environment
Flow
Vibration
Red & turquoise
Turquoise & yellow
Yellow & brown
Pink & yellow
Red & orange
Yellow
Orange
Wooden paper
Wooden paper