Two sheets, Brent oil on the left (top on phones) and US share prices on the right, each a calendar: one row per year, one column per month. Every month is one knife stroke whose slope is that month’s percentage change, on one scale for both. Falls slope down and cut through, so light shows; rises slope up and are only scored. December 2016 is a ring: there is no earlier month to compare.
Brent: World Bank, USD/barrel, CC BY 4.0. Shares: OECD via FRED, index 2015 = 100, citation required. Monthly averages; no dividends. No causal claim. Code: Luke Steuber, MIT.
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