(Central Public Works Department of India, designed 2010, completed 2012).

(Central Public Works Department of India, designed 2010, completed 2012).
Any way you slice it, that original concept was going to be a really tight fit for anyone actually having to work inside it. I would guess rounding it out gave them an entire extra floor of (admittedly windowless) offices. Or, failing that, somewhere to actually put the building's utilities.
I am a fan of the new Fisher-Price shape, but that expression... which, honestly, wasn't great in the concept are either. I want a fish friend that's happy to have people working inside!