“To kill two birds with one stone”, it means performing two tasks at the same time - preferably via one action.
Montage image relies on the association and the imagination of the human brain to compose things that are conveyed by the before image and the after image. Therefore, even if the appearance of the after image causes the disappearance of the before image, human brain always has its ability to keep them to provide messages as the evidence of connecting images
About this work, the audience must follow the indication of the artist to stand in the specific range to see the entire work. From image A to image B, the progress of the eye sight transferring, the audience tries to scrape together, save and connect the content of two images to complete the behavior of " To kill two birds with one stone" in the brain eventually.