The gesture chart in page 66 shows that the variation of the same symbol could convey different information, we use gesture to convey information very often in some special situation. The variation of finger could indicate alphabets or letters and numbers, and it is the silence way to convey the information. This silence way sometimes even stronger than the letters on the paper. We usually use gesture to indicate for numbers but rarely use it to express more complicated information. Nevertheless, gesture language a the most important language for deaf people, and also I seen a lots of military personnel use gesture to communicate each other. Beside letters and voice, gesture language could be the third language form for us to apply in our daily life. It is concise and convenient, for sometime we do not have pen and paper, or we cannot be hear.
Compare to the chart in page 66, the picture which in the page 67 is also shows the variation of one single object convey different information. The indicator lights on the train use the color change and the position change show us the different mode of the train. Once the communicational equipment breakdown, the train still have a trust tool to contact the others.
The image in the page 77 is a chart collect and combine the most longer river and higher mount on the earth, this chart is differ than the geographic chart we usually seen. Instead of use date bar or others to shows the information, this one convert the curve line of each river into a straight line, so we can clearly see the length of each and also juxtapose the branch steam of each rivers, In a short, this design tells us 2 information in one space.
I agree with what you are saying. All of these images show how small multiples have to convey information through repeating simliar but different patterns. They really can be the best design solution when use properly.
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