Today was pretty cool.  I was running the fly tower at Theatre Calgary.  It's a 70 foot tall structure that's used to fly in stage scenery. To my knowledge there's only 3 or 4 of these devices in the city and this on is one of the largest!  It has 35 linesets held in near balance with counter weight.  A moment's carelessness could spell disaster. I was the only Stage Carpenter there today setting up "A Christmas Carol", who was familiar with the system. 
It kinda looks like this, but not exactly this is a small one.

And here's a diagram that sorta shows how it works x 35 and 70 feet tall

    
  It kinda looks like this, but not exactly this is a small one.

And here's a diagram that sorta shows how it works x 35 and 70 feet tall

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Good luck with the new project!