"The road is passed by people will have footprints, reading is not it!!!"
A bookmark based on cat's claws, with 30 cat's claws on the bookmark.
Every time you read a book, you can mark the specific position you see with "paw prints. When we finish reading a book, we can count the number of cat's claws left to calculate the number of times we have read a book. Of course, if you read a book more than 30 times, you may need several bookmarks!! ......

Originally wanted to use human footprints as the basic elements.
But the cat is running around on the desk, so it is better to print the cat's paws on it.