Arecibo or a ZX Spectrum demo without any coding

17 bytes of standard ZX Spectrum tape header and 10 bytes of filename. What can you do with it? Tons of things! There were examples of using of colors, flashing, brightness, changing of text position and clever use of Spectrum's keywords.
But why didn't anybody use pseudo graphics? Seriously why?
One could create a tiny 8x4 pixel art. What a missed opportunity for 1982 :(
Playback speed is x2, because it would be too boring.
What associations do you have? When you see something in such low resolution there's a room for imagination. Can you draw something else in 8x4? Will you use it somewhere? Please, let me know.
This demo is dedicated to Arecibo message, that was sent 1974 to outer space. No replies still.
https://en.wikipedia.org/wiki/Arecibo_message
Nevertheless this demo is my message to humanity.
Can you decrypt the last two pages?

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