ELI5; When you close your eyes at night you see all these colours, and when you press your eyes they become more and more vilbrant the harder you push. What are those and where do they come from?
In: Biology
Your eyes are sensors that receive light and send that signal to the brain to be interpreted as what you see. Applying pressure as you describe activates the sensors in your eyes and sends signals to your brain, and what you see is your brains interpretation of the signals caused by the applied pressure.
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