The 7 looks like an bold sans serif 
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with speedlines. It also 
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seems  constructed of  tubes, 
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which seems inconsistent 
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with the speedlines, but never 
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mind. The 8 is constructed 
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of two barrel-like objects stacked 
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on top of each other, the 
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speedlines defining the curved 
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surfaces. The counters of the 
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eight are shifted. Hmmm. 
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A pair of martini olives on a stick?
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Carlo Bernoulli, designer