After seeing some of the cool invisible bookshelves that people had put on here, I finally got round to doing my own. Here are the results!

Step 1:

First of all, in a room where space is already at a premium, the logical step is to build up rather than out and make use of space that is otherwise wasted.

Step 2:

First, I measure the initial pile of books to work out the dimensions and strength of the 2 brackets required. I worked out that the brackets needed to stick out by 6 inches and be around 8 inches tall. I chose a 1 meter length of 5mm thick drawn steel as my brackets as they had excellent strength and wouldn't bent under the weight of the books.

Step 3:

I then had to bend the steel to 90 degree angles at each end for the brackets. I did this by wedging the steel in an unmovable item and bending it. Requires some strength!

Step 4:

I then had to drill the holes to mount the brackets to the wall. I did all this before cutting the brackets as drilling a large piece of steel is easier than fiddly small parts.
I then cut the brackets and mounted them to the wall.

Step 5:

Now comes the tricky part. How to mount the first book without damaging the cover. Well I did have to cut 2 small slits in the cover as shown. The brackets then slide through the slits and under the hard cover of the book.