The Lindens didn't want you to know.
>The Grid is flat, and surrounded by a gigantic ice wall.
>Beyond the ice wall, are more 'pond' Grids.
>You cannot go beyond the grid because the Lindens have set up BAN LINES
>You cannot see the horizon curve anywhere
>Gravity doesn't exist, at any time you can float and even FLY.
>Lindens set griefers on you if you step out of line, and then assassinate your character.
Stop believing their LIES.