Picasso’s revolutionary sculpture, Guitar 1912, and a Grebo mask (Ivory Coast, Africa) that he owned. Picasso stated that in creating this sculpture he studied the mask for its use of projections for eyes, nose and mouth from a flat plane, for how those projections implied another invisible plane ( a device he used for creating the sound hole of the guitar via a cylinder) and especially the quality in such tribal art that it is not illustrating a face but “re-presenting” it — a concept that concurs with a pivotal change between the art of the 19th century and the new art of the early modernists, i.e.e the use of symbols and imagery to represent subject matter and thereby add greater conceptual depth.