What relish is in this? How runs the stream?
Or I am mad, or else this is a dream.
Let fancy still my sense in Lethe steep;
If it be thus to dream, still let me sleep!

– William Shakespeare

Twelfth Night, Act 4, Scene 1. Sebastian wonders if he is mad or dreaming, because the beautiful Olivia whom he has never seen before is in love with him. He doesn’t realize she has mistaken him for Cesario – his sister disguised. Oh what a tangled gender web Shakespeare weaves, where not everybody is who they appear to be.