I suppose that could work... it'd be hard to cast a linear sight-blocker. I think just having circular hollow ones would work better. (Unless that's what you meant) Still work like force-field, but you could cast a single one and put all your zerglings under it. Especially if you're up against a Terran without Starport tech yet, they'll have to send in a spotter to see them. Or waste a scan.
Or cast it, stick your Hydralisks underneath it, then spot the mass-ranged army of your opponent with your fast-moving Overseer. Your long-ranged Hydralisks (or Lurkers, if they're put back into the game) can completely annihilate the enemy army before they even reach your forces.
It'd block charge too. And with Hydras, if they try to use an aerial spotter they can shoot it down.
Or for sieging an enemy base, with let's say Banelings. You can cast a Spore Cloud over their static defenses. Which will probably be at the edge of their base. They can't see out, and the Banelings can simply roll up to their defensive line without fear of ranged fire.
Okay, so er... try to ignore how horrible this drawing is and try to imagine the yellow circles as probes, the orange one as a nexus, blue ones as pylons, red ones as photon cannons, purple ones as Overseers, green ones as banelings and hollow purple circles as spore clouds.
In this instance, the Overseer can see into the Spore Clouds, because they can fly. The Photon cannons and pylons can't see out of the spore clouds. The banelings can't see into them either, but A) They don't need to, they can just walk into them and blast whatever is inside with melee range. B) they can see in with the Overseers watching. Also, the Nexus and Probes can't see past the two clouds (I drew it weird, but the spore cloud should go straight along the left cliff). So in essence the Protoss has completely lost sight of this little valley just outside his base, allowing the banelings to completely mop the floor with the cannons and Nexus.






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