Bolzano’s Wissenschaftslehre is one of the most important works of 19th century philos-ophy. Bolzano is however the author of some important but greatly underestimated works in moral, political philosophy, and aesthetics, as well. Vom Begriff des Schönen and Einteilung der schönen Künste put forward interesting views in both aesthetics and the philosophy of art, which oppose the Kantian and Hegelian perspectives. This paper discusses the account of beauty and ugliness given by Bolzano and aims to analyse Bolzano’s standpoints in the light of an understanding of beauty as "enigma". It shows how Bolzano sees the obscure concepts as the attribution of beauty, without promoting neither a theory of judgment of taste nor a dialectical theory of the mind. By conferring importance to the role of this kind of representations, Bolzano takes aesthetic pleasure to be a serious type of cognitive pleasure: an enigma but not a mystery.
Keywords: Aesthetics, Art, Beauty, Bolzano, Pleasure, Ugliness.