Pika Don is a word that has been integrated into the Japanese vocabulary as a result of the atomic bombs. Translated, PIKA means the flash (brilliant light) and DON means the explosion, representing what was seen and heard when the bombs were detonated.
After taking a picture of a flash, I scanned the negative and I destroyed the grain of the image by adding noise with photoshop. Then I painted the "sound / explosion" result on the print.