Yes, the Rosetta stone is one of those things, isn't it? Clearly important: expect to hear Beethoven's 9th playing whenever it comes on stage, with a backdrop of the Eiffel Tower and a PInt of Guiness in hand.
The Rosetta Stone decoded a culture of wisdom, aesthetics, poetry, politics. I saw it recently on a vacation trip that included a morning at the British museum. I was there to take some photos of the Shabako stone, and had never really looked at the Rosetta Stone before. But there it is, encased in glass, center of the foyer. You can walk around the stone, which means you can see the dark side of Rosetta, the unpublished side.
This has a transfixing beauty to it, like staring at the wall and seeing patterns in the plaster, or watching static on the TV. Does 'proper' static even exist in hi-def digital? (Also reminds me of The Scratch Pieces. ) But hieroglyphs are easy: decode the backside of the Rosetta Stone, and you decode extra terrestrial communication.