For his fourth solo exhibit at Dam, Stuhltrager, Mark Esper premieres Second Orrery, an installation encompassing a whirling tornado. The ethereal twisting column of gasses is reflected in other spiral forms that constitute the work, including a double helix and train running on looped track. Another spiral form is even less corporal than the tornado in that it isn’t seen. It is felt in time through the cyclical behavior of the piece, through the periodic adjustments in lighting coupled with the repetitive journey of the train, and the appearance and disappearance of the tornado. It is a spiral in time.