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A time-series is a pattern. It climbs upward and descends, patterns are stable or swinging, they change slowly or abruptly. The pattern is more important than the actual values. To understand the pattern it helps to read it aloud to yourself. “The first value is the smallest. A steep ascent follows. Then a descent roughly to the bottom again.” Time-series patterns are similar to sound patterns. A sound pattern climbs or descends just like values do. You can hear what you see and see what you hear. If you simultaneously hear and see the same your understanding is faster. Sounds read the pattern to you. Test audio sparklines.

Click on the large speaker symbol to play all patterns.
Click on a small speaker symbol to play a single pattern.

The question was: Do you use your handy for music and photos? 15 % said yes and I do not longer use other devices for both, the rest, 85 % said yes, but I also use other devices. The question was: are you in favor of restricting private use of music CDs? 85 % said no, 15 % said yes. The question was, do you manage a blog, a podcast or a video podcast. 70 % said, none of it, 9 % manage a blog, 3 % said yes a podcast, 6 % said yes a video podcast, 6 % said yes two of them, 6 % yes all three.
It took Tomorrow, a German magazine for gadget addicts half a page to hide this small piece of information. At least they summed up correctly to 100 % in each case…

If a graphic is needed to compare the values (is it?) try this: