Outta sight! This will be a great asset to blind 3D enthusiasts! I've been looking for invisible items for months, but I couldn't find anything appropriate. Only unsightly erotica props. You say your items will cover the entire gamut of human prehistory, history AND the far-flung future? What a spectrum!! Unfortunately, my wallet is empty (although maybe it is STUFFED with invisble money), however i'm also willing to send an invisible check. If it doesn't arrive, consider my order paid advance. Please post some images. I'm keeping my eyes peeled for this collection!