Do you remember how books in libraries were located in the olden days? First, you selected the right card catalogue cabinet and drawer by author or title, or number of strokes of the title for Chinese books. Second, you went through the cards for the book you wanted. Lastly, you proceeded to the relevant book shelf. If the book had been borrowed or misplaced, your previous effort would go to waste. With the launch of the efficient online catalogue, the card catalogue was discharged with honour. Today, you can look up books simply with a few clicks on your mobile device. Card catalogue cabinets, replaced by computers, are now often found in vintage furniture shops or eBay.