Modern technology has forever transformed the classroom. As calculators replaced abacuses, mobile phone apps have now replaced calculators, and such advancements continue to change how students learn. One way schools are notably different from those of the past is through the absence of a once major component of the classroom layout. Chalkboards are either missing or completely retrofitted in modern learning environments. In the 1800s, slate blackboards were the new technology, replacing handheld tablets of wood or slate. Within the last few years, schools have increasingly opted for cleaner "white boards" or "smartboards," which are digitally connected to computers and offer touch interfaces similar to those on tablets and smartphones. As ebooks replace textbooks and more assignments are handed in via digital documents, lockers may be the next to vanish.