This artwork is a renovation of the old Iron Gate in the entrance of the arboretum. The artist tried to express the passage of time with visual effect by repairing the original structure and installing a sculpture with an hourglass motif. The artist thought that human efforts to go against time created more distance between human and nature, but when we go along with the provision of nature like the grains of sand falling in the hourglass we can build an ideal city where humans and nature coexist. The artist also hoped that one-day the clear water of Samseong stream would overflow over this piece of work placed on the border of the arboretum and the Art Park. This was withdrawn in 2013 due to deterioration over time, but we want to record this in a digital archive to remember the hope of the artist.