A Ghostly question

My daughter and I were watching the movie "Ghost".I was trying to explain to her the phenomenon of Patrick Swayze in his astral body going through any solid object, like walls, doors, human beings etc. She asked me then why doesn't he go through the floor also and how is it possible that he is able to sit in the chair without passing through that.I was flummoxed. It had never occurred to me that if he could pass through solid objects horizontally, he should do it vertically too.Technically, he cannot sit in a sofa or stand on the floor as they show in the movie.Comments, anyone?

An Intro

Hi,
I am Revathi Balaji, advocate, wife of Balaji N and mom to 11 year old Maya Balaji.Cool, I didn't know it was this easy to get a blog. Two very enthusistic thumbs up.