These are a handful of 'ambiguous cylinder illusions' that were a finalist in the 'Best Illusion of the Year Contest 2016', which is a real contest that exists but disqualified my illusion based on pending litigation. Hey, you can't prove I actually cut my assistant in half if you can't find the pieces. The boat dock. What? I didn't say anything.
Keep going for the video, as well as another that explains how the illusion is created so you can try to slowly put the pieces of your brain back together.