1. An armed head: This apparition warns Macbeth to "Beware Macduff; beware the Thane of Fife." It represents the physical danger Macbeth faces from Macduff.
2. A bloody child: This apparition tells Macbeth, "None of woman born shall harm Macbeth." This apparition instills a false sense of security in Macbeth, making him believe he is invincible.
3. A crowned child with a tree in his hand: This apparition tells Macbeth, "Macbeth shall never vanquish'd be until Great Birnam Wood to high Dunsinane Hill shall come against him." This seemingly impossible prophecy again leads Macbeth to a false sense of security, as he believes he is invincible.
These apparitions are all ambiguous and open to interpretation, but they ultimately contribute to Macbeth's downfall by leading him down a path of paranoia, arrogance, and ultimately, self-destruction.