Today’s Daf Yomi page, Shabbat 125, contemplates building, a labor that's prohibited on Shabbat. But what does building mean? Are you allowed, for example, to open a window on Shabbat, an activity that changes the facade of a structure? Rabbi Dovid Bashevkin returns to shed light on this intricate question, and find in it a beautiful metaphor for always keeping our windows, and our hearts, open. Are we permitted to open an umbrella on Shabbat? Listen and find out.