People who are not fascinated by biology are strange
Watch the video:
Do I have your attention now? Good! The star of the show is clearly the process that is occurring from 1:15 to 1:26 (and then you see it again from 2:06 to 2:13). Although a lot of the processes in the video would look foreign to most people, this one seemed so utterly bizarre and so strange that many people asked if it was actually real, and if so, what the hell are they looking at? Well, here is your answer.
To start, it isn't an amorphous blue blob with feet, despite the fact that it probably looks like this at first glance. Also, yes, it is real. That process does indeed occur in the cell. The thing that appears to be a pair of feet attached to a blue blob is actually a motor protein called kinesin. The function of kinesin is to propel itself along a cytoskeletal structure called a microtubule (the cylindrical tracks which kinesin is walking across) by means of repeated cycles of binding, disassociation, binding, disassociation, binding, etc. In this way, like most other motor proteins, it will carry its cargo along "tracks" in the cell. Although the two heavy binding domains look like feet, ironically, we actually call it the head, or the motor domain. Also, the big blue thing isn't part of the protein (there is no protein that looks anything remotely like that). It is actually a piece of cargo, a vesicle containing proteins destined for transport through the cell via the maze of protein transport pathways collectively called intracellular vesicular traffic.
If you want to know about the other things going on in the video, feel free to ask.
"Physical reality” isn’t some arbitrary demarcation. It is defined in terms of what we can systematically investigate, directly or not, by means of our senses. It is preposterous to assert that the process of systematic scientific reasoning arbitrarily excludes “non-physical explanations” because the very notion of “non-physical explanation” is contradictory.