19th CENTURY ROTUNDA PANORAMAS

I am writing the first book from the American point of view about 19th century rotunda panoramas.These were the biggest paintings in the world,50 x 400=20,000 square feet, housed in their own rotunda which were 16-sided polygons. Chicago in 1893 had 6 panorama companies and 6 panorama rotundas.//Rotunda panoramas got their start 1878,1879,1880 in Belgium. Global panorama cartels were created in Brussels.I want to know more about the origins of rotunda panorama in Belgium.