Logo copying?

A story on the copying flap concerning the possibility of the logo for the Rio de Janeiro-based 2016 Olympics being copied from something of Telluride Foundation ends with the text:

Essentially, a research and design team should have been able to discover the similarities between the two logos if a Brazilian newspaper had no problem doing so. However, in turn, the Telluride Foundation logo bears a resemblance to Henri Matisse’s work, “La Danse,” making it difficult to decide whether any of these truly are plagiarism.