Is It Just An Optical Illusion Or A Magic Trick?

Subsequently, even when he was flying the drone 1,000 feet above the ground, he hadn’t decided to move it over the lake’s surface. But, he was exceptionally inquisitive to take in more of this enormous gap. Why would a lake have a gap right in the center without totally flushing it out? Without a doubt, there must be a logical clarification for this kind of an event, he thought.