Is it appropriate to put banner calligraphy directly above the office sofa? Will customers feel "memorizing words" when sitting on the sofa during the visit?

I don't think so. There are banners and calligraphy in the office, which is quite atmospheric. When customers come, they will meet first. I believe that the first thing that catches their eye is the banner, which will give people a very scholarly first impression. Then they will slowly sit down and talk about things at work, and they will no longer care about the calligraphy on their heads!