Tilted Nautilus X-ray photo
Imagine a Nautilus shell tilted to the surface of the X-ray sensor. The parts close to the sensor are sharp, the distant parts unsharp. Because the X-ray beam creates a central projection. The focal plane is the plane of the sensor, in focus are those parts close to the sensor.
The shell looks like entering the image or leaving it.
Julian Köpke
I like to make things visible the naked eye isn't able to see. That's part of my profession as a radiologist, too.