I worked for a while at a firm that had offices with transparent glass walls. The idea was that the glass would encourage a feeling of openness and collaboration at the firm. Occasionally, one of the newer lawyers would walk straight into a glass wall at full speed, which made a really great sound and would sometimes leave a little skin oil spot at the point of contact. And every once in a while, the force of the impact would cause the glass panel to shatter, covering the hallway with shards. Those were some of my favorite days.