The globe in the logo doubles as the letter o in "Hofstede" and in "of".
Mainly, it's a picture from Hofstede's Globe showing worldwide scores (well, almost - if you go to the site, you can turn the globe around) on the culture dimension of Long-Term Orientation, both validated and guesstimated.
Friends of Hofstede
As of Spring 2021, we have started Friends of Hofstede.
This is a forum for cross-cultural consultants who wish to keep abreast of developments in research. To know more, check my Blog about Friends of Hofstede.
Actually there are no age limits, contrary to what you might think upon seeing the picture.