1 - seen before or not? I hate to be pessimistic but I am pretty sure such a simple solution is used somewhere.
2 - To be flat or not to be flat? Shaded version is inspired by M. C. Escher waterfall or stairs drawings where optical illusion is used --- I think it adds visual value to a logo ... on other side I love simplicity and straight talking of flat version, too.
L or F like
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