When you say this is a reverse image search, does it search over multiple images to find the one which matches the closest? In the demo it seems to only search

When you say this is a reverse image search, does it search over multiple images to find the one which matches the closest? In the demo it seems to only search over a single image to find the cropped, stretched or rotated part of the image. Do you also have examples of negative searches where it doesn't find the image in question?