Surrealists are an interesting bunch! We wonder what the heck are they thinking (sex, desire) in creating what they create. The Vancouver Art Gallery has an excellent exhibition right now. If you are able to make it to their free tours (with entrance fee) on the exhibition - attend it, you will get so much more. It may not explain everything, but it will give you a glimpse of their artist minds.
FYI: Tuesdays after 5pm admission by donation.