The book digital ground presents new ideas about place and technology. I was particularly struck by the idea of technologies piling up at a place -an interesting problem is how this pile of technologies can be organized into a useful whole - device ecologies, and an extensible system (hardware and software) that can grow over time (and be subject to changes, e.g. devices removed, replaced, added,etc). Another interesting idea is how certain places fulfill or serve different aspects of life or functions, and the technology at a place should then be in accordance with the corresponding aspects of life or functions at that place, or at least be attuned to or be aware of context necessary for such functions and related activities. There are also other interesting ideas and underlying theories in the book which makes it an interesting read, and not only for architects and builders but computer scientists!