Piston displays work almost like 7 Segment Display and Pixel Displays but with 7 Segment Display and Pixel Displays you´ll have to wait for night to see the pixels fully. Piston Displays just push out the blocks you want and you can see it even if its daytime or nighttime.

A YouTube user called teapoted have made a video explaining some about a piston display he made, the video is named "The Minecraft Display Lab (Pixel & Segment Displays Walk-through)".

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