Shape skyscraper (de)formation

Hi!

I am trying to create a skyscraper which has a dynamic appearance. A kind of fluidity of the form.

I created a kind of simple shape for my skyscraper. It is based on a cylinder shape.

With a couple of curved "lines" I want to give the façade/form a dynamic/fluid touch.

I hope I explained it well ;)

I attached two pictures which are explaining the it a little better.

And I attached my rhino-file with the base-form.

The important question is, where do I start? is there a (simple) way to achieve this result?

Do I have to draw curves and loft them, or is there another way?

I hope someone is able to help me to get started!

Thanks in advance!

Maria