Oh, how I would love to open my book of ideas and let you point your finger to one, but unfortunately I would be sacrificed to the Gods by those lurking in the shadows (or those hiding behind an IP address).

Perhaps it is a cliché, but why not code a pretty advanced image uploading website? Or maybe something that communicates with an API, or scrapes content from a website? Those can be fairly complex.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.