Describir: Physical aspects of colour :

             ___      _____      ___      _____     _____     ______  
    ___     / _ \\   / ____||   / _ \\   / ____||  |  ___||  /_____// 
   /   ||  / //\ \\ / //---`'  / //\ \\ / //---`'  | ||__    `____ `  
  | [] || |  ___  ||\ \\___   |  ___  ||\ \\___    | ||__    /___//   
   \__ || |_||  |_|| \_____|| |_||  |_|| \_____||  |_____||  `__ `    
    -|_|| `-`   `-`   `----`  `-`   `-`   `----`   `-----`   /_//     
     `-`                                                     `-`      
 __   __  
 \ \\/ // 
  \ ` //  
   | ||   
   |_||   
   `-`'