The picture to the right shows a table with some sales figures for July. There’s nothing wrong with the table as it is, but I find it very hard to read and make sense of it. There are just a lot of numbers and dates, and you can’t even distinguish between weekdays and weekends. If we could highlight the weekends (or weekdays) it would be a lot easier to read these numbers. In this example I want to highlight the Saturdays and Sundays. Here’s how we’ll do it: