The inside of a Mosque displays an ornate decoration reflecting an infinite pattern. The Mosque contains no objective imagery, only lines and designs that correlate with one another. Patterns often repeat and play off of one another intertwining and eventually becoming one large design overall. Another common feature is the pointed arch. Islamic influence often uses a rounded arch with a definite point at the top of every arch. The Mosque is considered to be divinely guided, and the patterns represented inside are meant to imply this idea. Mosques must point in the direction of Mecca. Mosques also use calligraphy as an abstract design, along with bright vivid colors.
Gothic cathedrals were often very large structures which used architectural elements such as groin vaults and flying buttresses. Many Gothic cathedrals also had stone roofs, rather than wooden ones like previous churches. Gothic cathedrals were much larger than their predecessors, such as those from the Romanesque period. Gothic Cathedrals were designed with many large decorated stain-glass windows, which allowed for a colorful well-lit interior. Groin vaults were similar to islamic arches, except that the groin vault had a much more subtle point near the top of the arch. Flying buttresses allowed new ways of distributing weight across large stone walls, and were often adorned with sculptural features such a gargoyles or other religious symbols.