This bookmark is about merging old school with new school technology. Bookmarks were the last sync version of cloud storage for personnal knowledges!
3 differents models in differents sizes each: 58mm, 86mm and 115mm
As they are relatively smalls, I recommand the Ultra detail 0,05mm layer height profile.
The flat ones will be easier to print as the cloud as no texture on top, could be printed faster and with greater layer height.
The author hasn't provided the model origin yet.