Gravitation

 is a buff granted to the player upon consuming a Gravitation Potion. The buff allows the player to reverse the direction of gravity, allowing the player to fall upwards or downwards by pressing the Up and Down keys. This lasts for 3 minutes, but can be cancelled at any time by right-clicking the icon. Note that the player still takes fall damage, even when upside down (for example, you can get killed by hitting the bottom of a floating island).