@Jallibad(View Post) Gravity being "repulsive" is a physical hypothesis of "negative mass". By the way, everything to this date has positive mass. Negative mass would also be weird, imagine pulling in an object only to find it pushing away.
@Shriek(View Post) Its based on how the screen disperses large quantities of pressure all throughout the screen. Its just sort of a pressure glitch. After all, gas moves because of pressure and different pressure differentials.