Weird Pug

Arnie here: Gracie has a very strange habit. Mom adopted her when she was 2 years old, and she had this habit when she came to live with us. Gracie likes to hide behind the curtains. Not all curtains, just the see though kind. And she doesn't just hide there, she sits so that she's looking through the veil. And just sits there. For hours.

Do any other pugs have this weird habit? Gracie won't say why she does this, but I'm wondering if anyone has any insight into this?

Here's a photo of her just sitting there: