Cardboard camera

Today our German tourists delighted everyone with another overseas curiosity - a cardboard camera. To my great surprise, it was not a disposable cardboard camera from the supermarket, but a homemade one, assembled from a cardboard box and electrical tape. Conrad, the author of this miracle of technology, shared with us some secrets of cardboard photography.
Firstly, this camera does not have a single lens - only a small slit (natural pinhole camera). And since there are no lenses, that means there is no focal length - absolutely everything in the frame turns out clear (sharp). Plus the absence of spherical distortion.
Secondly, the camera uses medium format film with a frame side of 6 centimeters. This makes the camera super wide format.
Thirdly, the camera does not have a shutter - only a small piece of electrical tape covering the lens slit. The camera is installed on some support, aiming is performed and the electrical tape is torn off for a period of time from 2 seconds to... infinity. There is no upper limit on exposure time!
Well, and most importantly, such an apparatus is completely, absolutely exclusive. It is unlikely that you will meet a second one like this. And there will always be something to talk about.