This type of art focused on painting pictures or designs on vellum, was characterized by bright colors, intricate, organic, and flowing design, and functioned as a tool for those who viewed them because they transformed holy words into divine design. this type of art is called:

The right answer is illuminated manuscripts.

Explanation: Just to elaborate a little on the answer, it can be added that illuminated manuscripts originated in European monasteries in the early Middle Ages, although later on they were also produced in workshops for a private clientele. The pages of these hand-written books, which could be as small as a hand or as big as a palm, were made from the skins of young animals, such as a sheep or a calf, and they were meticulously decorated with paintings. Due to the religious value of these books, which contained prayers, the painted decoration that accompanied the text often featured precious metals, such as gold and silver. The decoration included initial letters, border decoration, and religious imagery.