Color #2 Informative Graph

This is a very interesting graph of passengers on the Titanic, their class of ticket, gender and whether they survived. Personally, I like its composition. 

Its color represents their crass of ticket. By using clear different colors, it is easy to find out how many crew and first, second and third class passengers are there. And, on looking  a rate of female/Male and survived/not-survived, we can recognize their proportion easily. 

It has an attractive interaction with line, direction, and scale. Connecting lines between class and sex, and sex and survived with determined color helps combining three different data into one informative graph. Direction as one of basic elements encourages our eyes and attention to flow from the top to the bottom smoothly. Finally, an element of scale helps us with comparing each proportion. Even though some of the basic elements work here, color has the strongest influence to inform those data. 

Source:http://www.agrandillusion.com/2009/03/of-graphs-and-men/