I’m about to shoot myself in the foot… Coffee table art books are sometimes designed to be laid out horizontally. (This also applies to large art folios if anyone has those.) They have sturdier bindings and covers with the assumption that they may be lying flat for long periods of time. The key here is not to stack too many of them because of their weight— the bottom one might deform. But two or three out where you can see them – they are meant to be displayed/stacked that way! :)