Rather than using a big printed sign I think the coolerst thing would be to make it with the material found on the site, for example branchs, sand, stones,... I'm thinking of the land artists work.
We could keep the idea od a big pointer icon but made of whatever we find on the ground near the launch site.
Would be less expensive, everybody could do it anywhere.
And the kaper could choose his scale, make a 10x10m sign or a make a tiny one placed on the top of a statue. That would add a lot more diversity and creativity to the project.
I also have comments about sending an object from person to person as vs. making one, but I'll put them over in the discussion about the project rather than here in the signup.