Double/multiple exposures are an illusion created by layering images (or portions of images) over the top of each other to create artistic looks, like a ghost effect, mirror images. This can be achieved in the camera settings, or when editing on Adobe Photoshop by creating LAYERS and then using BLENDING OPTIONS and OPACITY CONTROL. This technique has been used to explore Surrealist Ideas and produce dream-like imagery/imagery that explores time and time lapse whilst being a technique in which you combine at least two images into one to create artistic looks, like a ghost effect, mirror images.
This effects can also be created by slowing down the shutter speed and some cameras also have a setting especially for creating multi-exposure images.
My attempts using photoshop:
My attempts using camera settings:
