This was taken in the 1980s when I was at college I remember. I think it was done with a pin hole camera? Take a sheet of photographic paper and put it in a tin with a tiny pin hole in it in a darkened room. Have a flap of paper or card to cover the hole, then you can take a photo by removing the cover over the pin hole. You will need to experiment with exposures because the paper will react to light. You need to know how quickly the paper will darken. Once the picture is taken you cover the pin hole again and develop the picture. As it’s 40 years since I did this I don’t remember what the chemicals are that you need. I do remember that if you are developing film you have to take it off the reel in complete darkness and you end up with a negative which you then project onto photographic paper. With a pin hole camera you use black and white paper and the image comes out as a positive picture.
There are other forms of pin hole images. You can project a live image on a wall using a tiny hole if there is bright sunlight outside. The image cast will be upside down. This is called a camera obscura and may have been used by painters in the renaissance and onward to project accurate images onto their canvases..