Van Beek actually spoke to the original informants of Griaule, who stated: "though they do speak about sigu tolo [interpreted by Griaule as their name for Sirius], they disagree completely with each other as to which star is meant; for some, it is an invisible star that should rise to announce the sigu [festival], for another it is Venus that through a different position appears as sigu tolo. All agree, however, that they learned about the star from Griaule." So whatever knowledge they possessed, it was knowledge coming from Griaule, not knowledge native to the Dogon tribe. Van Beek also discovered that the Dogon are of course aware of the brightest star in the sky, which they do not, however, call sigu tolo, as Griaule claimed, but dana tolo. To quote James and Thorpe: "As for Sirius B, only Griaule's informants had ever heard of it."