Mysterious housewife

Now hanged in the Goethe Institut, my collaboration with Sara Wong consists of a large new photograph and a book of Tokyo of the 1950s. The very small back figure of a typical housewife at the centre of a photo from the book has become the inspiration of the large print. Both should be visually corresponding to each other.
However a friend just told me he saw that work 2 weeks ago for the first time just as seen above. But recently he went to the gallery again and looked at the work. He just couldn't find the housewife in the old photograph. We checked it today and nothing has changed. It's really mysterious....