At the beginning of autumn, we have had several days with rapidly fluctuating temperatures, usually cold mornings combined with sunny lunchtimes. At lunchtime on one of these days my colleague and I went to a nearby park to play our almost regular ping-pong match. After finishing it, we just realized that people around us were wearing t-shirts, and both of us were wearing way too warm clothes, coats, flat caps. Actually we were looking like two poorly masked undercover agents. undercover agents, park, ping-pong, table-tennis, drawing, illustration, sketch