One of the most ambitious aspects of Castle’s later work is his in-depth exploration of bronze. While not new to his practice, the scale and perfection of his castings now attained new heights. The casting is based on a small-scale handmade model which was then enlarged to a hard foam “plug,” which in turn was used to make a mold. The finishing of both the plug and final bronze involved intense workmanship, both in terms of surface texture and added color through the application of patina.