https://en.wikipedia.org/wiki/Roll_film (the cite)
Explanation:
Photography didn’t truly become accessible to amateurs until the mid-1880s when inventor George Eastman began producing the film on rolls. The film was more lightweight and resilient than clunky glass plates, and the use of a roll allowed photographers to take multiple pictures in quick succession. In 1888, Eastman used flexible film as the primary selling point of his first Kodak camera, a small, 100-exposure model that customers could use and then send back to the manufacturer to have their photos developed.
by the age of 2 a child understands emotion like my little sister I'll ask her to make it angry face and she'll make the cutest little angry face ever back on subject the brain has already developed a sense of emotion like happiness or anger so little Tommy would perform good he may mess up sometimes but we all mess up