What book is it that tries to scientifically explain vampires? It talks about why vampires don’t like crosses and it’s because of some irrational fear of symmetrical geometry or something. In other words it has nothing to do with religion, according to that book’s mythos. I thought it was a neat alternative take on the genre. Iirc it was a sci-fi book.
Edit: I looked it up, the book I was thinking of is called Blindsight. I believe the reasoning they provide in the book is that due to their unique spatial reasoning, too many right angles give them seizures.