Rubin's vase

Rubin's vase 

An ambiguous drawing, which may be perceived either as a vase or as two human profiles facing each other (Fig. R14). See Blivet figure; Necker cube; Schroeder's staircase.
Fig. R14 Rubins vaseenlarge picture
Fig. R14 Rubin's vase
References in periodicals archive ?
Like a Rubin's vase illustration where the negative space between two profiled faces reads as an urn, Achaintre's paintings and sculptures impel the viewer to flip back and forth between two realities and thus engage in an exercise that brings an existential flux to her works.
France was first with prints employing the trickery, but it was subsequently developed in about 1915 by Danish psychologist Edgar Rubin and popularised as Rubin's Vase. Recognition requires something the shrinks call "higher cortical processing".
Look at the illustration of Rubin's vase. What do you see?