Here’s a quick shot of a shelf in my office;
http://im1.shutterfly.com/media/47a3d631b3127ccef38159be7f3000000030O00AcNWThozbN2gPbz4A/cC/f%3D0/ls%3D00407634825820130810195354470.JPG/ps%3D50/r%3D0/rx%3D720/ry%3D480/