I am a volunteer at the Missouri Department of Conservation Nature Center, and once a year we go on a statewide trip...this one to Kansas City. While there we got a chance to use a huge hand-operated press. On this piece, I painted the glass plate with a roller, then took cottonwood leaves and painted them atop the glass. A paper was laid over that and I hand cranked it through the large padded press. What a surprise...a piece of nature art!