Oh no, the mouse got trapped in the book! 

Use this funny bookmark as a great gift for a little bookworm. My niece surely gets one this christmas.

While the idea is done many times before, the design is fully mine. I have tried to make the eyes really blow out.

The eyes are made click-fit. But you can also glue them in, if it is a gift for children.

UPDATE: Thanks for all the feedback. I have added two new variations of eyeballs. 
- MouseEye_Clean.stl Use this to paint a blak dot on, or make a filament change for the last layers
- MouseEye_FilamentHole.stl This has a hole in the middle of the eyeball, that fits 1.75mm filament