Dear Rabbi Abadi,

Something I’ve been wondering about. Many mechitzas have holes, gaps, or lattice work, so the two sides can still see each other at least partially. If that’s the case, what is the mechitza actually accomplishing? Is there a minimum halachic standard for what counts as a valid mechitza, or does any divider qualify? What did communities do in earlier generations, before the mechitzas we know today? And why is the women’s section often upstairs, where the women can look down and see the men? Doesn’t that work against the purpose?

Thank you very much