Photography was all about tracing shadows. Leading to the invention of the pantograph machine which would trace the big object into a small object. The difference between the physionotrace (invited by Gilles Louise) and a painted portrait is that it was more mechanical, unlike paintings which were more objective and subjective.

Camera obscure, meaning a dark room, where a hole would be made on one side of the room, and an image would appear on the wall inverted, which was then improved by putting a lens on the hole to make the image more focused and brighter. Then Joham Henrich came up with the chemical action of light on silver salts where he tried to prove that photography was all about light and not heat.

In the 1760s there was the concept of making profiles by the agency of light, by Thomas Wedgwood, using silver nitrate on a paper then placing an object on top. The effect would be seen after putting it on the light; unfortunately, it did not work as the object would disappear after some time.

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