Ovid's 'Metamorphoses' (Day Two: Books 4 and 6)

For today's readings, we have five main myths: The Minydes, Hermaphroditus, Perseus, Arachne, and Tereus / Philomena. Choose at least two of these five myths and look for a common theme within them. What is the theme? In what ways do these myths deal with this theme? Use quotes from the text to support your ideas. Remember - I'm looking for thought and analysis, not a retelling of the plot.