Please check this video: [https://www.youtube.com/watch?v=Q1bSDnuIPbo](https://www.youtube.com/watch?v=Q1bSDnuIPbo) . At around 10:40 it starts explaining why it looks like this. This is combination of fact that all matter will tend to fall onto black hole in circular pattern, and rest is gravity so strong, that you can see back of black hole from even when looking directly from the front.
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