Stained glass, semi-circular arches, and groin vaults are all contributions of the Romanesque architectural movement, which preceded Gothic architecture. Deliberately incomplete architectural elements are a feature of Baroque architecture. Gothic architecture is responsible for the flying buttress.

Gargoyles, while used somewhat during the many centuries of medieval art and architecture, are most commonly thought of as a Gothic architectural attribute. While used for decoration, they also commonly had the function of diverting water from the building. Gargoyles were frequently monstrous and grotesque, because they were meant to strike fear into the peasants who saw them and motivate them to attend church.

The "rose window," as seen in Gothic architecture, is large, circular, often centralized window, that is divided by an intricate pattern. Sometimes the window looks like a wheel, and other times it seems to resemble a flower; however, the window is never flower-shaped. It is always circular, but sometimes has a visible flower within.

Although arches, and, to come extent, columns and the use of gold were all stylistic choices of the Gothic period, the answer is "light," because light was more than a simple stylistic choice. Light was a representation of divinity, and the large amounts of interior light were important for worship.

The Flamboyant arch, known as such because it resembles the shape of a flame, was a commonly used feature in Gothic architecture. It is made from four original points, where each large arc turns upward into a smaller arc, all meeting at one sharp point.

The Lancet arch is the simplest of all Gothic arches. It is simply composed of a vertically long opening with a pointed tip. Although the Flamboyant, Equilateral, and Depressed arches follow a similar pattern, they all have more complicated designs than the simple Lancet arch, which really is just a long opening ended with a point.

Although arches are decorative and tend to be elongated in nature, the towers and spires of Gothic buildings add real height, and contributed to those buildings having been called the skyscrapers of their time.

Although different types of arches were often included in ribbed vaults as a decorative measure, the actual architectural element of ribbed vaults was developed to support the weight of the ceiling, and allow for larger and higher windows to be built, which had the effect of brightening the buildings a great deal.

Image from Wikipedia Image Commons: https://commons.wikimedia.org/wiki/File:Voûte_musée_de_Cluny001.JPG

The flying buttress is both decorative and architecturally essential for Gothic-style buildings. It is used to support the walls of the building by resisting the force of the sides under the weight of the ceiling. As such, the walls do not need to be as thick, and there is more material that can be used for decorative measures, rather than reinforcement. The flying buttress came to be used heavily during the Gothic period, and is nearly an essential piece of any large building built between the 12th and the 16th centuries, and beyond.

When Chartres Cathedral was first built between 1194 and 1250 it was a highly representative example of the Gothic architectural form then in vogue in Western Europe. As such, it included a stained glass rose window above its entryway, flying buttresses along its side, and a wide variety of statues depicting theologically important figures such as saints or Biblical characters. Today, an obvious anachronism exists in the form of a Flamboyant steeple rising to a striking point on one tower, which comes from the early sixteenth century and looks out of place on the more rigid and ornate Gothic building