An oscillogram, an image of a bright trace of musicAn oscillogram, an image of a bright trace of music
Three intertwining snakes in a blue mist on a black backgroundThree intertwining snakes in a blue mist on a black background
The sign of the number pi is made up of black digits on the background of a row of gray digitsThe sign of the number Pi is made up of black digits on the background of a row of gray digits
On a black background, a large blurred circle of blue colorOn a black background, a large blurred circle of blue color
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