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# One may signal in the air, water or on a dry board in the form of letters if it doesn’t leave any mark. <Ref> Rama 340:4, Mishna Brurah 340:22, Shar Tzion 340:28 </ref> | # One may signal in the air, water or on a dry board in the form of letters if it doesn’t leave any mark. <Ref> Rama 340:4, Mishna Brurah 340:22, Shar Tzion 340:28 </ref> | ||
==Pictures== | ==Pictures== | ||
# Taking a photograph is forbidden as it draws an image, but one does not have to avoid being in a picture taken by a non-Jew for his own purposes. <Ref> Mayim | # Taking a photograph is forbidden as it draws an image, but one does not have to avoid being in a picture taken by a non-Jew for his own purposes. <Ref> Mayim Chaim O”C 1: 145, Shemirat [[Shabbat]] KeHilchata 16:26, Rivivot Efraim 3:230 </ref> | ||
# Regarding walking in an area where there is a surveillance camera, see [[Electronics on Shabbat]]. | # Regarding walking in an area where there is a surveillance camera, see [[Electronics on Shabbat]]. | ||
==Books== | ==Books== | ||
# One may mark (not in the form a letter) a parchment by pressing one's nail on the parchment because it doesn’t last, yet it’s preferable not to do this because some authorities forbid this. <Ref> S”A 340:5, Birkei Yosef 340:5 that Or Zaruah and Smak forbid, Beiur Halacha s.v. “Mutar” </ref> However, all opinions agree that it’s forbidden to mark a paper as it’s soft and the mark will last. <Ref> Mishna Brurah 340:25 </ref> | # One may mark (not in the form a letter) a parchment by pressing one's nail on the parchment because it doesn’t last, yet it’s preferable not to do this because some authorities forbid this. <Ref> S”A 340:5, Birkei Yosef 340:5 that Or Zaruah and Smak forbid, Beiur Halacha s.v. “Mutar” </ref> However, all opinions agree that it’s forbidden to mark a paper as it’s soft and the mark will last. <Ref> Mishna Brurah 340:25 </ref> |