troika_squaring_the_circleIn the Modern European Philosophy class this past week, we were discussing Locke and his distinction between primary, objective qualities and secondary, subjective qualities.  Locke argues that shape is objective, while color is subjective.

This piece, titled Squaring the Circle by the art trio Troika, challenges this distinction.  From one side, it appears to be a square, but from the other, it appears to be a circle, showing that even shape can depend on perspective.