It was foggy while I was walking home from work tonight. There was a dark and empty park to my left and a brightly lit shopping centre to my right, beyond the railway line. I looked across the park and thought I could see someone walking across the grass. I looked again but couldn't see anyone. I carried on walking and thought I saw several dark ghostly figures moving through the fog. It was a few seconds before I realised they were my own shadows, caused by the lights from the shopping centre.