How to make such sofa?

 From:  Mike K4ICY (MAJIKMIKE)
4782.4 In reply to 4782.3 
Yes indeed Michael, and even better with Voxels - but MoI is tool irresistible a tool not to try ;-)

In the case above, I drew the profile of three bulge sections with the freehand curve tool. Then I varied the scale of each progressive copy of the profile after arraying them. So the Lofted surface of the profiles makes for a useful shape.

Riko, If you wish to make complex and organic shapes like sofa cushions, they can often be created with careful thought using the Loft, Network or Blend commands...
And often combinations of each. The examples Michael provided are great ones to take a closer look at,
especially this cool retro looking one: