Macbeth. is this a dagger which i see before me,
the handle toward my hand? come, let me clutch thee.
i have thee not, and yet i see thee still.
art thou not, fatal vision, sensible
to feeling as to sight? or art thou but
a dagger of the mind, a false creation,
proceeding from the heat-oppressed brain?
- william shakespeare, macbeth, act ii, scene i
what evidence leads you to believe that the dagger macbeth sees is an
illusion?