Playing with 2 column interactions

Verrrrry early days, but Invision Studio is perfect for exploring these types of ideas. The drag to resize is imperfect, but clicking and dragging slowly gives a great impression of what this would be like in reality, and it only took a few hours to get all up and done.

Invision Studio prototype is here (A, B and C were to explore how the swap behaviour might work — A clearly winner). https://projects.invisionapp.com/prototype/Side-by-Side-cjutfr5uc000i1y011l1qqfk0/play/d1b44526