Studies have shown that there are ideal character limits per line. Ideally, you should settle on 35, 55, 75, or 95 CPL (characters per line). People tend to prefer either shorter or longer lines. Since we're really trying to showcase photography here, let's go with the shorter CPL. If you want to read the full report, you can find it at http://psychology.wichita.edu/surl/usabilitynews/72/LineLength.asp.
To a large extent, the width of our text columns will be dictated by the devices themselves. On smaller devices, we really have no choice but to go a 100% width. Once we get to tablets in landscape mode, we'll have room to do creative things with our text. We could, for larger widths, increase our CPL to 55 and it would look great. We may also consider using larger images as well. Whatever we do, having a strong set of media query breakpoints is the key.
Let's take some paragraphs of text about sessions and make it more responsive with this study as a...