Dada was an art movement that grew out of abstract and modernist movements in the early twentieth century. One of the most famous dadaist artists was Marcel Duchamp, a frenchman who began his career in a cubist vein, but then sought to make art that was less "retinal," or simply pleasing to the eye. Duchamp's art work challenged the very notion of what was "art," as in his 1917 "Fountain," a urinal Duchamp placed in the middle of a gallery space and only attributed as "R Mutt."

This painting is by the Medieval artist Fra Angelico and known as the Cortona Annunciation. Painted from 1433-1434, it depicts the archangel Gabriel telling the Virgin Mary that she is pregnant with the Christ child. The Annunciation, as a key moment in the Bible, was a very popular theme in Medieval European art. This particular painting was part of an altarpiece in a church in Cortona, Italy, and painted by a priest.

Saint Sebastian was a martyr of the early Christian church who died in the Diocletian persecutions of the third century CE. He became a popular figure in medieval art, usually shown as being tied to a tree with arrows in his sides. This image was to convey what an appropriate Christian martyr should look like.

As one of the most revered figures in Christianity, the Virgin Mary was a constant theme of medieval religious art. In order to function as a highly visible symbol in a mostly illiterate culture, many different symbols were used to distinguish Mary. Most important was her robe, which was typically a bright blue color, which denoted expensive silks.

Saint Stephen is traditionally considered the first martyr of Christianity, and his death by stoning is told in the biblical book of Acts. Due to the circumstances of his death, he was usually depicted with a stone implanted in his skull. Thanks to his position as "the first martyr," Saint Stephen very commonly depicted in Medieval art.

While Christian iconography and themes feature as the most common subjects in Western art, certain periods were more heavily indebted to Christian tradition. During the period of Gothic art, which was roughly synonymous with the twelfth, thirteenth, and fourteenth centuries in Europe, Christian themes were almost the only ones used. Even in royal portraits, such as the Wilton Diptych from England, featured saints and angels next to the King.

Sandro Botticelli's The Birth of Venus is one of the signature paintings of Early Renaissance art from Italy, and as such deals with many themes prominent in the era. Botticelli chose the ancient goddess of love, appearing nude and fully formed from the ocean on a clam shell, instead of a Christian theme. Additionally, the picture's symbolism and color focus more on Platonic ideals than the Christian symbolism that was so prevalent in late Medieval art.

The Quran, the Islamic holy book, made Muslim artists pursue calligraphy for two different but related reasons. Calligraphy was the easiest mode of transmission for the written Quran in the early years of the religion. Additionally, Quranic prohibitions on creating figurative art made many Muslim artists pursue the geometrical and literary art of calligraphy.

During the Renaissance, with a renewed focus on classical art and scientific understanding, visual arts underwent a significant change. In particular, religious themes dwindled in importance in comparison to classical subjects, and deeper, more varied colors were used to represent more realistic depictions of the human form.

A triptych, from Greek words meaning "three fold," was often placed at the altar of medieval and early modern European churches. The paintings allowed for three separate scenes to be shown in one place, which allowed both the artist to depict three related topics and show the viewer a larger scene than one panel would allow. Triptychs were largely used for religious topics in the middle ages, but have remained a popular style up to the present day.