2018 ESTATE OF PABLO PICASSO/ ARTISTS RIGHTS SOCIETY (ARS), NEW YORK; ERICH LESSING, ART ... and print. However you choose to engage with us, please know that some things about National Geographic ...

This story appears in the May 2017 issue of National Geographic magazine ... providing visual proof that an individual was there. But prints may be hard to pick out on a shiny or highly patterned ...