How do you hold up a roof?

Seems like a simple question: Walls hold up a roof. And if your roof is heavy and two or three stories up? A stronger, thicker wall.

This is the problem faced by the builders of European churches in the 11th and 12th centuries. With those thicker, stronger walls, windows became a problem because they weakened the walls with holes, which meant that the churches had small windows and were rather dank and dark places to worship the Creator.

When we are taught about Romanesque and Gothic cathedrals in our art history classes, we are usually given a list of characteristics they have: round arches for Romanesque; pointed arches for Gothic: thick walls for Romanesque; flying buttresses for Gothic: barrel vaults for the Romanesque;  rib vaults for the Gothic — as if the shift from one to the other were merely a catalog of stylistic tics and the change from one to the other nothing but a change in fashion, as if giving up pegged trousers and taking on bell bottoms.

Why would it be important for art history students to spend this much time on something so old and arcane? Our professors always seemed to think this was such a profound change and worth a week of class time. We couldn’t wait to move on to Impressionism.

It was never made clear in class why it would be important for us students to know these things: buttresses, rose windows, naves and aisles, apses and choirs. These cathedrals were in Europe, not America.

But the change from Romanesque to Gothic should not be seen as merely a change in styles, but as a major innovation in architecture whose results led to the glass and steel skyscrapers that populate all our cities. The Seagram Building in New York is merely an extension of the ideas behind Chartres cathedral.

What happened was (for reasons I will get into in my next blog post) someone figured out you didn’t really need walls to keep a roof up. You could, like a picnic pavilion, support the roof with posts, leaving the space between the posts open. And, if you build a church this way, you can glaze the open spaces with colorful glass and let inspiring light into the interior of the church. Wow. In an instant, churches became lighter, both by weight and by illumination. What had been dour and forbidding became bright and inviting.

Perhaps the most dramatic example of this is the small royal chapel built on the Ile de la Cite in Paris between 1238 and 1248. While it is tiny in comparison with the big cathedrals, such as Notre Dame or Reims, it is a glory of glass. Its walls are explosive with color and light.

If you were to stand in the middle of Ste.-Chapelle and gaze up at the ceiling, you would see that the ceiling and roof are supported by a cage of stone pillars, between which are cascading sheets of stained glass. When you realize that such roofs are made primarily of lead or slate, you realize how heavy it must be, and how brilliant was the engineer who figure out how to keep it up with only these spindly supports.

This is the genius of Gothic architecture. Follow its logic out to the 20th century and you understand that you can make a skyscraper with a cage, not of stone, but of steel, and glaze the open areas and let light into every one of the 40 or 50 stories of office space. In some sense, the International Style — all those glass-and-steel towers that define our urban architecture — are really just a further refinement of the Gothic breakthrough.

Ste.-Chapelle was built for King Louis IX, later known as St. Louis, as his private church on his palace grounds. It was meant to house a series of holy relics he had bought, including the supposed “crown of thorns” Jesus had worn upon his crucifixion, and a piece of the “one true cross,” of which there were a whole woodpile scattered across Europe. These relics were held in great esteem. Louis wanted a home for them that would honor their importance with great beauty and wealth, and Ste.-Chapelle is the result.

Louis spent 40,000 livres on the chapel, but nearly four times that in buying the relics from the cash-strapped Byzantine emperor, Baldwin II in 1239. The chapel was built to hold the relics and finished in record time.

Ste.-Chapelle is 118 feet long and 56 feet wide, but more importantly, 139 feet high. Above that a spire of cedar wood extends another 108 feet. (The current spire is a 19th century replica, designed after the 15th-century spire. It is unknown if the original chapel had a spire).

The church is a two-story affair, with the lower level once reserved for the royal staff and servants, while the upper level, with its grand windows, was for the king. He had an elevated walkway built between the palace and the chapel’s second floor so he never had to descend to ground level with the hoi-polloi. The palace is largely gone now, replaced with the bureaucratic buildings of the Paris metropolitan police force, but Ste.-Chapelle remains on the grounds, surrounded now by parking lot.

You can see how it once sat, in the illuminated manuscript of the Limbourg Brothers, made in 15th century and known as the Très Riches Heures du Duc de Berry.

Today, there are lines waiting to get in to see Ste.-Chapelle. You walk through security and through the parking lot and into the ground floor chapel, where the fleur-de-lys seems to be painted everywhere in gold. It is a stunning space, even if its ceilings are low. The paint is bright and colorful. The staff wasn’t cheated; the lower chapel is plush and beautiful.

But then, you walk up the stone staircase to the main floor and it is as if the heavens open up above you. The glass, the color, the light: They stun.

In 1323, the French writer Jean de Jandun wrote of Ste.-Chapelle in his Tractatus de Laudibus Parisius, “The most excellent colors of the pictures, the precious gilding of the images, the beautiful transparency of the ruddy windows on all sides, the most beautiful cloths of the altars, the wondrous merits of the sanctuary, the figures of the reliquaries externally adorned with dazzling gems, bestow such a hyperbolic beauty on that house of prayer, that, in going into it (from) below, one understandably believes oneself, as if rapt to heaven, to enter one of the best chambers of Paradise.”

While it is true that Ste.-Chapelle was restored in the 19th century, its restorers attempted to be exceptionally faithful to the original. And while most of the paint is more recent, a full two-thirds of the windows are original 13th century glass. The remaining panels replace glass removed when the chapel was used as a government records archive after the French Revolution.

The glass in the nave tell primarily Old Testament stories, in the apse the glass covers New Testament stories. The 15 stained glass windows, each more than four stories high, depict 1,113 scenes from the Bible in 6,458 square feet of glass.

The great Rose window is a replacement from 1390 when the original window, in Rayonnant style (as seen in the Très Riches Heures), was updated into the then-current Flamboyant style, with its curlicues and circles.

The tympanum painting above the king’s doorway is a recreation, but in the style of the original.

The designs in the floor are wonderfully graphic.

The columns and walls are brightly painted.

All this color, light and throat-grabbing beauty is understandable on esthetic terms, but its purpose was more than to be pretty, or even awesome. The philosophical momentum behind the architectural advance will be discussed more thoroughly in the next blog, about the basilica of St. Denis.

Click on any image to enlarge

Next: St. Denis