Concentric neon circles and squares appeared first, notably in the transitional White Light (1962). Mostly black, it incorporated a cut-up Thonet chair and a box-form of found rabbit fur. In the same year, he moved on to his central engagement with neon in architectural space with his Hanging Neon, whose colored tubes jut diagonally into the viewers' space from a box suspended from the ceiling. He continued this key dynamic boldly in many large mid-1960s installations: Orange Vertical Neon, Red Neon from Wall to Floor, and Red Neon from Wall to Wall. There are small-scale models from the period for many more. All fulfill the artist's definition of his work as "real things in real spaces."