thumb|300px|Priscian, or the Grammar, marble cameo panel dated 1437–1439 from the bell tower of Florence, Italy, by Luca della Robbia. The scene is an allegory of grammar and, by implication, all of education. Note the opening door in the background and the unshod feet of the first pupil.
thumb|300px|Priscian, or the Grammar marble cameo panel dated 1437–1439 from the bell tower of Florence, Italy, by Luca della Robbia. The scene is an allegory of grammar and, by implication, all of education. Note the opening door in the background and the unshod feet of the first pupil.