Hopes and Fears explores hallucinating on web browser tabs and talks to philosopher Ned Block about optical illusions:
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You probably spent a week or two in high school learning about optics, occasionally finding relief from lectures in illusions projected onto the whiteboard. In my case, public school budgets meant that the projectors were routinely dim, out of focus, and off-color. The examples yielded an anemic crop of effects that lasted a few seconds. What little knowledge I acquired in class was muddled and superficial: cones and rods got “fatigued” and “adapted” in response stimuli, creating afterimages. Our retinas translated photons into electrical signals, which, after being “processed” in various parts of the brains, emerged miraculously as non-electrical visual experiences. Little did I know, it gets so much better.
YouTube and more generally, the internet paired with a computer screen, offer the chance to revisit these visual experiments and the scholarship behind them.