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My idea is to hide a lot of "Easter eggs" around my university campus, that people can see using an AR app.

The best thing would be to not use qr codes or anything of that sort, as it can easily be torn off. I was wondering if it's feasible to use certain statues as triggers, or maybe a specific building or a table that has a certain marking to it.

The most important thing is for everything to be shared with all the students on campus. Ideally, one would just have to download an app and go around campus looking for the Easter eggs.

How can I do that? I did a bit of research on the Facebook spark AR, but i got the impression that it's for one thing at a time, I can't really add 20-30 things at once and make them instantly available to the other students.

I can program my own app if needed, but I would rather avoid that.