In an interesting passage in the Philebus (51c, cf. 56b–c, an enlarged and slightly modified list), Plato associates pure beauty with geometrical forms created by certain measuring tools used both by mathematicians and carpenters. The ‘beauty of figures’ is analysed as' something straight [εὐθ⋯ τι]… and round [περιφερ⋯ς] and the two- and three-dimensional figures (sc. σχ⋯7mu;ατα) generated from these by [τ⋯ρνοι] and ruler [καν⋯σ7iota;] and set-squares [γων⋯αι]' He continues: ‘For I maintain that these things are not beautiful in relation to something, as other things are, but they are always beautiful by nature, by themselves…’