Candle, magnifying glass, photosensitive paper
“OGA AP studio Exhibition 6” OGA AP Studio, Fukuoka, Japan
In the photo you can see the flame of the candle upside down. It became the long flame as you can see on the photosensitive paper. You can see fire and shade in the paper. You notice that time is passing when observing the after image as you glance at the candle.