The Hall of Mirrors is both the destination of Louis Lucas de Nehon’s mirror-making ambition and the measure by which it falls short: his work did not reach the hall in time, but his late breakthrough helped establish a glassmaking process that continued at Saint-Gobain. In the account of the project, the hall’s renovation creates a deadline, while the demand for mirrors large enough to serve it turns a promising craft experiment into a contest over scale and production.

Setting and Commission

The Hall of Mirrors is the large-scale project around which Louis’s bid for a mirror concession takes shape. Work in the hall is not yet ready to begin: carpenters and masons must finish first, giving Louis roughly six months to demonstrate that his method can produce pieces of sufficient size. The delay offers him time to experiment, but it also sets a fixed horizon for a process whose results remain uncertain.

Charles Le Brun, the official portraitist to the King and a powerful figure in ministerial circles, has influence over the award. He tells Louis that the likely competitor is Joubert, a talented maker whose narrow mirrors are attracting attention in Paris and Versailles. The concession therefore depends not simply on Louis’s skill, but on whether he can persuade Le Brun that his method can meet the hall’s particular needs before the project begins.

Louis’s Proposal and Demonstration

Louis presents Le Brun with a set of six small mirror pieces. He lays out five, edge to edge, to form a larger whole, and Le Brun places the sixth to complete the rectangle. The demonstration makes the proposal visible: individual pieces can be joined into a larger reflective surface. Louis says he hopes to produce several thousand for the Hall of Mirrors concession, turning a small sample into evidence for a much more ambitious undertaking.

Le Brun immediately asks whether Louis can make larger pieces. Louis admits that the demonstrated size is the largest he has achieved, after only five months of producing the pieces, though he believes further time may improve the result. Le Brun offers a conditional opportunity rather than an award: Louis may use the glassworks at Tourlaville to refine his process, and Le Brun will assess his progress. If the pieces become large enough, the concession will be Louis’s; if they do not, it will go to Joubert.

Work at Tourlaville

Le Brun’s arrangement gives Louis access to the equipment as well as a private shop and office at Tourlaville. Louis brings experience from Murano that is described as centuries beyond that of anyone else at the works, but that advantage does not quickly solve the technical problem. The first enthusiastic weeks pass into months, and the plates improve only slightly in size. The sought-after scale remains out of reach even as the deadline approaches.

The strain becomes visible in Louis’s face and grows with each appointment at which Le Brun offers an excuse rather than a decision. Serge, rubbing his tired red eyes, suggests taking a break. Louis refuses because they are already behind schedule, directs Serge to check the furnace, and bends over the copper forms to align them. The scene makes the cost of the effort concrete: progress is slow, the work is physically demanding, and the approaching concession deadline leaves little room to pause.

Outcome and Legacy

Louis does not complete mirrors for installation in the Hall of Mirrors in time. He later explains that he made the mirrors by hand; they were close to perfect, but not perfect. His decisive breakthrough with cast mirrors came only at the very end of the project, too late to fulfil the hall’s original timetable. The distinction matters: the work yielded a usable result, but not the result required at the moment the concession was being pursued.

After taking his final payment from Le Brun, Louis helped a factory at Saint-Gobain in France mass-produce the new glass. The factory remained in operation at the time of the later account, and Louis retained a substantial percentage of the company. The Hall of Mirrors is therefore linked to a project that failed on its immediate deadline yet carried its technical outcome beyond the hall itself: the mirrors missed their intended setting, while the method found a future in industrial production.