The Camera Obscura projects an image on a white concave horizontal screen, like on a table, which is situated in the centre of completely darkened, black painted room.The projected images are coloured and luminescent and they reflect everything that happens at this very moment outside the tower (moving images in real time).
To focus the different distances the screen moves up and down, which allows the screen to focus, just like in a camera. The images in the Camera Obscura can be moved forwards and backwards to visualize the different parts of the landscape. Above one can see the horizon at a certain distance, and below, examine details.
The principal lenses of the optical instrument have a plane astronomic object which is produced with a degree/level/grade from 4” (10,16 cm) to 12” (30,48 cm) of diameter and with focal radiuses which are designed for each building in particular.