Often in design, they suggest grouping things together in odd numbers. There is something visually pleasing in odd numbers. But two can be equally as delightful when we are mindful of the connection.
It's totally up to you whether you choose to demonstrate a near-human connection or you just artful frame your two subjects. Just try to bring two things together (either two of the same things or two totally different objects) in a way that speaks to you.
James and I went for a wonderful hike in May, and along the way I took this picture. Right then I said that it looked like the trees were hugging, or at least the right tree had its arm around the left. I think this is one of my favourite shots from that walk.