Weird lighting... I think you would just perform a lot of Boolean addition modifiers since the object looks to be made out of repeated geometry. Then retopologize the modifier to get better results with turbo-smooth.
These are Ikea lampshades that are made up of a about a dozen repeated shape cutouts. Find the instruction manual for it and you should see the shapes that need to be modeled. Model them flat, then bend them into place.
I would recommend against boolean-ing anything here as that will cause a whole lot of unnecessary work.
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I would recommend against boolean-ing anything here as that will cause a whole lot of unnecessary work.
I think it's just 2 shapes, you really one need to bend 2 pieces correctly and then duplicate them around.