The sadness of Elphaba being genuinely excited to attend her first party and her face when she realizes Galinda set her up to be laughed at, the excruciating commitment by Cynthia Erivo to play this scene in wicked so tragically yet heartfelt.
So Dorothy’s silver slippers? Public domain. You (or Wicked) can totally use them.
Dorothy’s ruby slippers? Created by MGM and protected under copyright. Don’t even think about it.
And that, my friends, is all of the reasons why they couldn’t just make the shoes ruby.