When most people hear the words “tumble” and “pottery” in the same sentence, they might envision a pile of broken shards. But tumble does not always have a negative connotation in the pottery world. Tumblestacking – stacking pots on top of one another in a kiln, separated only by wadding – is a popular way to load pots in atmospheric firings because it can influence the path of the flame and the marks it leaves on the pots. This is the method Judith Duff uses in her train kiln to beautiful effect. Today, in an excerpt from the newly expanded Wood Kiln Firing Techniques & Tips: Plans and Instructions for Making a Wood-fired Kiln and Firing with Wood, Judith shares her firing method and the plans for her train kiln.