I recently delivered a presentation on the upcoming 802.11ax amendment. Within this presentation I did a couple of hands on demonstrations. One of them was intended to give the audience a better understanding of SNR and why it matters to RF Modulation. In the demo the participants were asked to put on some “fog glasses”. The effect doesn’t translate well in video, but just to give you an idea, here is a picture of the fog glasses I created for them. I hope you find this explanation of modulation useful and feel free to share!