The Necker Cube is an optical illusion first proposed by Swiss crystallographer Louis Albert Necker in 1832. The cube is a two dimensional line drawing that may be interpreted as a three dimensional cube in one of two orientations. The cube is often presented as a symbol of ambiguity and an illustration of the human brain’s ability to switch between two states of perception when presented with an ambiguous image.
The Necker Cube was first proposed as the symbol for androgyny in c.1996 by Raphael Carter in The Angel’s Dictionary, part of the Androgyny RAQ:
Necker Cuben. 1. An optical illusion in the shape of a cube. May take either of two forms:
. . .
Proposed by the author as a symbol of androgyny, because it is either concave or convex depending on how you look at it. I prefer this to the mars-plus-venus sign, which depends upon a juxtaposition of stereotpyes (sword and shield for male, looking-glass for female), and which, furthermore, combines the signs for the two most irritating gods in the Roman pantheon. If we must depend on Greek mythology, I would prefer to take a cue from Janus and use some variation of the two-faces motif on the cover of some editions of The Left Hand of Darkness. The Necker cube, however, is simpler, and suggests ambiguity in more than mere gender. Who wants to design the lapel pin?
Practical Androgyny uses an adjusted form of the Necker Cube with a smaller square in the centre, as focusing on this square may allow the brain to break out of its cycle between two ‘equally possible interchangeable stable states’ and see the image for what it is; a two dimensional drawing which is neither of the interpreted cubes. Thus the androgyny symbol is itself an example of something that can be taken as one of two binary options or as something else entirely:
The Necker Cube is symbolic of the androgynous individual’s physical ambiguity. Regardless of whether we identify our genders in the terms of a gender continuum, as being without gender or as being something else entirely, the Necker Cube symbolises the ambiguity we present to a world that is primed to see all people as one of two binary options. Androgynous people can be taken as female, male or as something else entirely but, like the Necker Cube, our ambiguity invites those who interact with us to question what they see, and perhaps strive to see the true picture.