This is a LEGO® tool which I use every day, to hold open my book for me. It is surprising that your book actually feels lighter when you don't have to expend energy on keeping it opened.
LDRAW file available bookminder.ldr.
Since it is easily taken apart, it works great on travels as well, especially on plane trips. And people notice...
The large shock absorbers are available per two as Technic Accessory pack 5252, see www.lego.com (about 5 USD in 2003).