A Few collage cards

Here are my latest finished pieces of collage art. I decided to make a few cards, sized approximately 5 x 8. I was looking to create something a little more elegant. 

The first one has a window that frames a gate on the inside. On the top is a piece of a book page torn out of a 1950s mathematics book. For the black card I used a page from a Spanish book from the 1880s. It's the original page. I didn't make a copy of it. Also on the inside is a section of a page of an index of classical composers and that page was so old that the paper was falling apart as I was handling it. Now that it has been glued down it will be preserved for much longer.I don't see it as destroying originals. I like to have and see authentic pages, and also to use them in my work. Sure, I'll use some printed images off of the internet, but I prefer having a stash of random old pieces that I can use in a variety of creative ways.