Tall skinny books can typically be found up high on the shelves. Here's an explanation of why this is the correct answer:

1. Understanding the description:
- The question describes the books as "tall" and "skinny."
- Typically, books that are taller and thinner in size are placed on higher shelves to maximize the use of space and accommodate more books in a library or a bookstore.

2. Placement of tall skinny books:
- Libraries and bookstores often organize their books based on size, genre, or author's last name.
- When it comes to tall skinny books, they are usually placed on higher shelves so that they can be easily seen and accessed.
- Placing tall skinny books on higher shelves also helps to create a visually appealing and organized display.

3. Benefits of placing tall skinny books up high:
- Accessibility: Placing tall skinny books up high makes it easier for people to locate them, especially if they are looking specifically for this type of book.
- Space optimization: By placing tall skinny books up high, it allows for more books to be placed on lower shelves, utilizing the available space more efficiently.
- Visual appeal: Displaying tall skinny books up high creates an aesthetically pleasing arrangement, adding variety to the overall layout of the shelves.

In conclusion, tall skinny books are typically found up high on the shelves in libraries and bookstores. Placing them in this position allows for better accessibility, optimizes space usage, and enhances the visual appeal of the book display.