I, and I think the law in most cases, would agree that the designer owns the design. I guess, the grey areas crop up when you need to define what the design is, and how many elements of it need to be present for it to be the same design. 1
track out of 50 is not a sound design, but is 10? 20? 30?
Lighting design looks to be the easiest to figure out in the worst case scenario. Set,
props, costumes... these elements will have a lot of materials that are property of the
Theatre that the designer can not take with.
So, in the hypothetical situation, a costume designer bails (lets say no one is at fault, there is simply a breakdown in the relationship) halfway through the construction process. 50% of the costumes still need to be constructed, there are concept drawings for 90% of the costumes, what do you think is the correct solution?