They don’t make pen-work like this anymore!

Puzzle letter, f. 1r, Constantinus Africanus, Viaticum, ca. 1220-1244, Z10 76

 

Pen-flourished initials (Latin littera florissae) like this one marked the beginning of a work, chapter, or other section.  The most common colors used for these initials were red and blue.  While this particular initial is not as elaborate as some, the red line-drawings inside almost resemble a seashell or something similar to my eyes.