Question: [![lotr meme](https://i.stack.imgur.com/SsEzO.jpg)](https://i.stack.imgur.com/SsEzO.jpg)
i know smeagol and gollum are basically the same person, but what does it mean in this meme?

Answer: 
I think the students will look at it form **their** perspective. Unless something warns them, the audience will likely look at it from their perspective. An experienced orator would be aware of this and pick their words carefully.

To clarify, the teacher (as he stands in the picture, facing the class) might say ***my*** left-hand side (yellow), or ***your*** left-hand side (red).

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As I suspected, there is a distinction. I don't know anything about hearts and muscles, but that doesn't matter. The speaker is using the **middle** of the image to distinguish the left and right sides. As a casual observer, I understand his words to mean that he is talking about the purple and yellow figure. Whether or not it is accurate is not a matter of English usage.

There is also the possibility that he is referring to the entire image. Before the video cut to this image, he was standing to the right of the image, facing the viewer. If in his mind he does not know that the video will cut to this image, and he has a live audience in mind, then referring to *the left-hand side* would be with respect to the audience's perspective and it would include the entire image.
In that case it should be clear it is the left as seen by the audience.

Why?

Because when having a look at the diagrams, which are on a 2D surface, there is no difference between the speaker perspective and the audience perspective. 

This is clearly an other matter when designing elements which are in the 3D world, as the perspective might be different. But the speaker should instinctively refer to the same side, because of this.