In my last video, I asked you to tell me whether you think that I exist. Many of you submitted great answers. For my new video I have picked two examples to illustrate three key points.

First, explaining sensory input is all you ever do.

You collect data with your senses and try to create a consistent model of the world that explains this data. Even scientists and their papers are just sensory input that you use to create a model of the world.

Second, confidence in existence is gradual.

The only reliable statements about what exists are based on models that you use to explain observations. But the confidence you have in these models depends on what data you have, and therefore it can gradually increase or decrease. The more videos you watch of me, the more confident you will be that I exist.

Third, how confident you are that something exists depends on your personal history. It depends on your experience and your knowledge.

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