How do you compare different periods or different categories in 2015? Simple – you move your data around and explore it. The GIF below shows various ways of seeing seasonality.
![](https://66.media.tumblr.com/343ae7de1c1e0b92d10808078ef0d174/tumblr_inline_nq6vlpperC1sr3w0m_540.gif)
Back in 1914, Brinton recognised this too. But how could you implement it?
Index Cards! They can go side-by-side or one atop the other:
![](https://66.media.tumblr.com/cd39d5d266ccdd4624e2a1b933dcf059/tumblr_inline_nq6vwsFztw1sr3w0m_540.gif)
And don’t worry, Brinton has a whole chapter on how to implement, store, maintain and secure this system. Fret not, “it is work any man of even ordinary caliber can do”
![](https://66.media.tumblr.com/2901bb62e38d606f70ef3ea5aef61438/tumblr_inline_nq6vzl8yQ21sr3w0m_540.jpg)
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