This designer Logitech-inspired Braille calculator by Merve Nur Sökmen hopes to serve the 2.2 billion people in the world who are visually impaired. It consists of two sections—the left side represents the display section using Braille numbers in place of a digital screen, whilst the right side consists of the necessary buttons in Braille form. Each group of buttons features a unique surface finishing, so they’re easily identifiable by the users.