Broken for you, by Stephanie Kallos, is a wonderful book I just finished reading.
Broken for you, by Mother Nature, is what happens to the bottles in your bottle wall if you don’t cap them.
To be more specific: Rain + freezing temperatures = shattered glass
Yes, this happened last year. No, I did not learn.
I did start collecting caps and snapping them onto bottles, but it is dull work, and makes the bottles less attractive (imho), so I haven’t gotten very far.
The only upside to collecting the shattered fragments and mentally kicking myself was the fantastic ice shapes that emerged from the broken bottles.
Sustainable Scientist 
Too bad the ice bottles won’t stay!!
display the bottles upside down? instead of capping, you probably already thought of that;)
Yeah, I was going to do them upside down to begin with, but S wanted them upright. Haven’t revisited an upside down plan. I’m open to suggestions!