Making ice wine:

The pictures capture it best. I used a small bladder press. You fill the wood basket with the grapes and then apply air pressure to the internal bladder. The expanding baldder presses the grapes against the wood shell, extracting the juice. The juice falls to the bottom tray where it drains into a bucket.

The increasing pressure effectively re-froze my grapes, making it impossible to extract additional juice. Halfway through I removed the wooden shell to allow the grapes to thaw more before completing the process. One shot captures the free-standing frozen mass of grapes.