[Spiral of Lightning in a Thunderstorm]. Artist: Charles Moussette (French, active 1880s). Dimensions: Mount: 9 13/16 in. ? 6 7/8 in. (25 ? 17.5 cm) Image: 6 5/8 ? 4 5/8 in. (16.9 ? 11.7 cm). Date: May 12, 1886. Museum: Metropolitan Museum of Art, Ne