Ernst Chladni at the understanding of electron orbitals. Since at least 1738, a musical instrument called a "Glasspiel" or "verrillon", created by filling beer glasses with varying amounts of water, was popular in Europe. The beer glasses were struck by wooden mallets shaped like spoons to produce "church and other solemn music". Benjamin Franklin was sufficiently impressed by a verrillon performance on a visit to London in 1757 that he created his own instrument, the glass armonica, in 1762. Franklin's armonica inspired several other instruments, including two created by Chladni. In 1791, Chladni invented the musical instrument called the "euphon" (not to
Paris in the 18th century Robespierre and a member of the radical Jacobin club, became the unofficial minister of propaganda of the Revolution. He created a series of paintings associating the French Revolution with the virtues of the ancient Rome, and designing costumes and pageants for the Revolutionary government. After the fall of Robespierre, he was imprisoned, freed, and at the beginning of the 19th century was painting portraits of Napoleon Bonaparte. Of the great French writers of the 18th century, the two most famous, Voltaire and Jean-Jacques Rousseau, spent most of their careers far from Paris, either in exile or under strict censorship. Early