The humble receipt gets a redesign

What she created–using a grocery receipt of her own as reference–was a better receipt, with three distinct elements. But each individual item features a bar chart of its own, representing how expensive it was in relation to other items in the category. One specific limitation Lu discovered during the process was that the printer could not draw horizontal lines, which meant she had to use various visual tricks at the pixel level to create her bar charts, along with the tiny icons of bread, dairy, and meat that she designed, too.

Source: www.fastcompany.com