off limits
The first impression is that there are no limits. All seems to be open and wild and free.
If you step across an invisible barrier of any kind, it isn't immediately obvious. You could probably cross that line a dozen times without being aware that it is there. It does exist, though. Each time it is crossed, it becomes slightly more visible, gradually. It is as if the keeper of the border is almost infinitely patient. Almost. If you choose to spend time here, you need to watch carefully, keep an eye on that line. Eventually, if you keep walking over it in your ignorance and haste, it will become solid, and you may trip on it.
The next time you trod carelessly toward it, you won't be able to cross, you won't even trip over it. You'll find, quite suddenly, that it is a brick wall, unclimbable. If you persist, if you push on the wall, you'll realize it isn't even only impassible. It's an electric fence and your stubborn insistence on trying to bypass it will lead you to nowhere. Much better to stay on the outskirts, enjoy the appearance of freedom of access, and accept that some places are just off limits to you.
If you step across an invisible barrier of any kind, it isn't immediately obvious. You could probably cross that line a dozen times without being aware that it is there. It does exist, though. Each time it is crossed, it becomes slightly more visible, gradually. It is as if the keeper of the border is almost infinitely patient. Almost. If you choose to spend time here, you need to watch carefully, keep an eye on that line. Eventually, if you keep walking over it in your ignorance and haste, it will become solid, and you may trip on it.
The next time you trod carelessly toward it, you won't be able to cross, you won't even trip over it. You'll find, quite suddenly, that it is a brick wall, unclimbable. If you persist, if you push on the wall, you'll realize it isn't even only impassible. It's an electric fence and your stubborn insistence on trying to bypass it will lead you to nowhere. Much better to stay on the outskirts, enjoy the appearance of freedom of access, and accept that some places are just off limits to you.