Describir: Theories of perception and the concept of structure :

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