by yamachem - uploaded on April 1, 2017, 3:52 pm
The image depicts what we call "Rubin's vase or Rubin face or figure-ground vase".
When two fields have a common border, and one is seen as figure and the other as ground.(from wikipedia Rubin_vase)
This clipart is a remix from:
Female Head Profile Silhouette
Heads Vase Illusion 2
Heads Vase Illusion