:-\I had a strange idea how to create real artillery :
why not make an invisible ring with a radius of something like 20 m, to place somewhere infront of a canon and then tell the canon "this dofire Ring"? The canon (i think) targets the center of the ring and -since there is nothing- doesn't hit anything! The projectile then flies through the air until it goes down somewhere with a bang. I'd call it "taoist-artillery-system"
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Possible?