Pen on printer paper.
 
Ernest Hemingway is one of the greatest writers that has ever lived.  Each sentence that he writes has a strong gravitational pull; it is as if each sentence were its own universe. 
 
Further reading:
 
https://www.poetryfoundation.org/poets/ernest-m-hemingway
 
https://www.nobelprize.org/prizes/literature/1954/hemingway/biographical/
 
http://www.umich.edu/~eng217/student_projects/nobel%20prize%20winners/hemingway.htm
 
https://en.wikipedia.org/wiki/Ernest_Hemingway