Art does not evolve by itself, the ideas of people change and with them their mode of expression.  When I hear people speak of evolution of an artist, it seems to me that they are considering him standing between two mirrors that face each other and reproduce his image an infinite number of times, and that they contemplate the successive images of one mirror as his past, and the images of the other mirror of his future, while his real image in taken as his present.  They do not consider that they are all the same images in different planes.

To me there is no past or future in art.  If a work of art cannot live always in the present it must not be considered at all.  The art of the Greeks, of the Egyptians, of the great painters who lived in other times, is not art of the past; perhaps it is more alive today than it ever was. 

 
  
Excerpt from Statement by Picasso:1923