This image was shot while roasting coffee in a fluid-bed roaster. Hot air is being pushed through the beans at a high velocity from below, carrying only some of them up near the top of the roasting chamber. It was challenging to shoot, as the beans were moving very quickly, and I wanted to give the impression that they were floating. I found it interesting how only some of the beans were being carried up, while the others rest on the bottom of the roaster, even though they were all subjected to the same hot air.
Full report can be found here: https://www.flowvis.org/wp-content/uploads/2020/12/Image-Video-2-DK.pdf