Hallucinatons can be auditory, visual, or sensations like smells or touch. Everyone is different in how they experience hallucinations.

For me, I see a man in my house sometimes. He is about the same size as my husband, but he's not. My husband is always sitting at his desk or somewhere else from when I see this man, not walking around or anything. He wears a blue and white striped shirt. I never see his face, his head is usually a blur to me, and his legs, too. Sometimes he's a shadow standing in the dark, like against a window. Like you can see him blocking out the light.... It's scary.