SiR's logo scores high on technical merit, for me, by being well executed and humorous. good work.
I wouldn't profess to be an expert in these matters but, and it's a big but, does the professor's head still look like the Raspberry Pi logo when viewed in black and white and from a distance ?
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Perhaps a few more auditions for the part should be invited before we grab him by the lapels and thrust him into the pink-tinged spotlight of Pidom.
Bob van den Born created 2929 "Professor Pi" comics
Here's a link