How was this photo taken?

This pen was actually in a falling state when taking pictures. It needs the help of an assistant before the photographer can capture it.

The specific steps are: large aperture, shallow depth of field, high-speed shutter, and the shutter speed is at least 1/500 seconds, preferably11000 seconds. When taking pictures, the assistant stands the pen on the desktop and the nib is fixed on the paper. When the photographer gives an instruction, the assistant gives a little force to make the pen fall in the required direction, and the photographer takes the opportunity to take a snapshot. Even if you use the camera's continuous shooting function, you may not be successful once, and you need the cooperation of photographers and assistants many times.