Gravity
Gravity is a mechanic that defines natural movement of elements that are gravitable. It is not a unified force โ each gravitable element has its own gravity direction and setting. Gravity defines the notion of "falling", but it does not necessary have to be directed downwards.
Zonks, infotrons and orange disks are gravitable and fall downwards.
Special ports can toggle the zonk gravity. When zonk gravity is off the zonks become frozen.
Most gravitable elements fall down, but some can follow other directions. Anti-zonk is an example, as it "falls" upwards.