The bookend was produced as support for the model scanned and optimised by Silas Merlin, distributed on SketchFab (https://skfb.ly/6VL9p - https://skfb.ly/6VMAs). It portrays a monkey reflecting about evolution while sitting on Darwin's books.
The model comes in two versions, one with and one without a protective strap that distances the figure from the books. It works equally well but I find the one with the pad more aesthetically pleasing.
The model is rather small, so scale up for heavier tomes.
The author remixed this model.
Conversion to bookend.