Ha ha ha! You only THINK I am stuck in a concrete room, but that is a lie! In all actuality, I have captured THE REST of the universe in concrete. After all, if there is no normal way for me to reach the rest of the universe, there is no normal way for the rest of the universe to reach me! It just happens that I lack a lot of money, so all I could afford was this table and a mirror.*
*In a closed universe, starting at the concrete, they can go in any direction and if they overcome the expansion of the universe, they will eventually return back... staring at the opposite side of the concrete. So you see, both are cages, I've just been extremely generous and made theirs far LARGER then mine.
____
Of course... assuming I get bored... heh, that might be true soon. There are a NUMBER of ways I can escape this situation and free the universe from it's concrete cell! For instance, in building this, I couldn't afford to pay my income taxes, so in a few weeks, the tax man will show up with an audit. After I don't respond and laugh at him, he will return with a jackhammer and take away my table and mirror to pay for back taxes
.
If I desire to leave sooner however, I could lucid dream and walk THROUGH the mirror. After all, in dreams, mirrors are actually a somewhat thick highly reflective fluid with other worlds on the other side. Then when I wake up, I conclude thoroughly that I am not living in the old world but in the "mirror world" - I will be certain of this a few hours later when my ENTIRE biological structure decays because it now holds the inverse
CHIRALITY, leaving me to die a horrible painful death.
At this point, leaving becomes a necessity however, because releasing the universe from my concrete cage will help me attain a higher plane of existence. Consequently, I will rejoin them on the other side by going up to Heaven. They may however, be forever trapped from acquiring my table and chairs... at least until the tax man comes.