Inscriptions of both runes and letters have been found from the Middle Ages. Johan Bollaert has found equal use of visual resources in both inscriptions. But there are also differences between the use of runes and letter inscriptions. Among other things, the runes (on the left) were carved into hard rock types such as granite and quartzite, while letter inscriptions were carved into softer rock types such as marble and limestone.Credit: University of Oslo
