I recently purchased "Space and Geometry" by Sean Carroll. Wonderful introduction to General Relativity! I wanted to say what a joy a well made, written and illustrated physical book is. I am not a Luddite, eBooks are useful and fill a need but the physical feel of a beautiful book will never be obsolete (I hope)! Is it my age (52) or is something more than that? The book has been with us since the beginning of recorded history (is that a tautology?). There is the feeling of actually owning a beautiful object that an eBook cannot replace. What's your opinion?