For this challenge, I decided to play with ND filters, in order to simulate a ghostly presence. I triggered the bulb mode using a remote control, during about 40 seconds. I tried to stay as still as possible during about 2/3rd of the exposure, then promptly left the frame, letting the previously hidden background hit the sensor, creating this little effect.
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Great image and camera control for basic.
(Hope you don't get too many idiot validation requests and if you do it was a timed shot...not double exposure