Abelardo Morell became recognizable from his variety of using unusual methods; he explored the art of photography in different ways. He made tintypes, glass negatives, cyanotypes and, most famously, the camera obscura. Threshold Concept no 2 states, "Photography is the capturing of light; a camera is optional." Abelardo shows in his work that you do not need a camera in order to capture a photograph, and that there are many ways that you can make a photograph without an actual camera. Camera obscura is one of them but it wasn't the only thing that he did that didn't involve a camera; he also did cyanotypes which you also don't need a camera for, just the light. All these ways of photography can be linked to the second Threshold Concept. When Abelardo makes a camera obscura, he captures light by making the light go the specific way that he wants it to go; creating a small opening inside of a dark room allows the light to enter from that small opening. By making a small opening, Abelardo has controlled and captured the light inside of the dark room, or box. To create a camera obscura,
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