Very simple thing to maybe save on the amount of particles generated from source relays (potentially multiple). Basically, just being able to use a wand of dominion on two adjacent jars so that one jar sends its source to the jar adjacent/above/below while the target jar isn't full.
Implementation:
- Jars must be directly adjacent or above/below to be linked
- A jar can only be linked to send to a single other jar and receive from a single other jar.
- Transfer of source stops when the target jar is full.
In practice, you could have a stack of jars and have each one set to send it's source to the one below it while it's not full. Relay would only need to send to the jar at the top of the stack.