'Echoes' in Human Mind

In neuroscience, "echoes" could refer to the brain’s neuronal reverberation, where sensory input—like visual or emotional stimuli—triggers ongoing neural activity. The overlapping patterns–designed through generative coding in Javascript–illuminated by light in a dark environment, create emerging patterns that are projected onto a wall. These illusions are achieved through motion and light interplay, relying on principles of human visual perception, which are not just tricks of light but reflections of the brain's inner workings—how neural processes construct reality through predictive coding.

Then, what happened at a lower level? In the visual cortex, light and motion leave traces of what has been seen. These traces, through continuous reverberation and processing, produce optical illusions that make sense to the human brain, even if they don’t align with physical reality. As an example, the additional layers and depths perceived on the wall don’t exsit physically, but still can be interpreted by human brain.