Why chairs? "I wanted to work with the concept of konseki , the idea of ephemeral traces," explains Yamamoto with a shy smile. "When someone rises from a chair they leave behind an impression in the cushion or the warmth of their body or some trace of their energy. So a chair seemed to be the perfect vehicle for this phenomenon." Yamamoto feels it's easy to visually connect with a chair. "Chairs are made for the human body and used in daily life so it's easy to generate a feeling or sensation in the mind when viewing a sculpture based on a chair form," he explains carefully. Backed by this familiarity, he feels that chairs can induce a story or a sense of mystery and anticipation. "After somebody has left a chair there's that feeling of something different, that something has changed," he says. "Who was sitting there? Will they come back? What would happen if I sat in the chair? People can create their own story." For Yamamoto, imagination is the key. "It's like the chair is one piece of a puzzle. The viewers can take this piece and create their own puzzle, their own story, from their own imagination," he explains. "With the right visual incentive, 100 people can have 100 different ways of looking at the same thing."