Are you sure you're not thinking of the "hairy green ball thing" from his discussion of visualizing topology examples? https://books.google.com/books?id=_gA_Dw

Are you sure you're not thinking of the "hairy green ball thing" from his discussion of visualizing topology examples? https://books.google.com/books?id=_gA_DwAAQBAJ&pg=PT87&lpg=PT87&dq=feynman+%22hairy+green+ball+thing https://books.google.com/books?id=_gA_DwAAQBAJ&pg=PT87&lpg=P...