I remember seeing that modern pyramid, the TransAmerica building, in San Francisco. I never went in it. If you actually do go up it, does it look any different from the inside? That is, can you tell you are in a strange building just by looking out the window? Are there any distinct features inside the building or did they just made a regular skyscraper narrower as you go higher?
And why didn’t anyone else make a building like that–cause it was too inefficient a design? Or it would no longer be unique?
Making another building like it could be viewed as trademark infringement. The building is Transamerica’s logo. Beyond that, any architect that blatantly copied it (or any other distinctive building) would be criticized.
As for what it’s like inside, it’s pretty much like any other highrise building. If you look at where the outside wall meets an interior wall, you can see the slope, but it’s nothing at all like the Luxor hotel in Las Vegas that has an extreme slope that you’ll bang your head against.
Unfortunately, since 2001, the public is not allowed inside - only tenants and approved guests can visit the 48th floor. Once it was the observation deck, it’s been retooled as a conference center.