Pixel graphics through vectors

I understand that normal pictures made of pixels would lag the computer a lot, but what about using vectors to draw pixels instead? By vectors I mean it would draw multicolored lines, circles and polygons instead of each pixel. Therefore, the server would only have to send you a couple of coordinates and colors, rather than a huge ugly amount of pixels or characters. It would allow the minecraft client to interpret the vector shapes, rather than the server.

It would make operating systems look awesome too. Imagine OneOS or Quest with better graphics.

I like that idea. Cutting down on the info per tick should decrease lag, and therefore allow for more pixels right?