No this isn't some flat Earther stuff. This is a bootleg of the button that set off the beloved Whole Earth Catalog... but this one glows in the dark! 1.5" in diameter. Read below for more info on the origin!
"Prior to publishing the Whole Earth Catalog, Stewart Brand was a member of the art collective USCO, known primarily for its experimental light and sound environments and film projections mounted in museums, dance clubs, theaters, and universities. This feature about USCO includes an image of a pinback button by Brand reading, “Why haven’t we seen a photograph of the whole Earth yet?” He distributed the button widely as part of a campaign for public access to images taken during United States space missions. He believed that a picture of the entire planet would be a unifying force in the management of global ecological challenges."- Moma