daf bit: Chanukah
The rabbis call for the Chanukah lights to be lit just outside one's front door (not inside). This can raise problems of liability. We learned elsewhere: if a camel laden with flax spills its load into a shop, catching the shop-keeper's light and starting a fire, the camel-driver is liable, but if the shop-keeper put the light outside his shop, the shop-keeper is liable for the loss of the flax. What about the Chanukah lights? Rabbi Yehudah says the shop-keeper is exempt. The rabbis go on to conclude that this means the Chanukah lights must be placed within ten hand-breadths of the ground, not high up, because if placing them high up were acceptable, the camel-driver would have recourse to claim that the shop-keeper should be liable. Why do we not just require that the lights be high (out of camel-range)? Because if it is too much trouble, he might refrain from the mitzvah of the Chanukah lights. (21b)

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You may or may not be surprised to know that there is modern responsa liturgy (halachic rulings, basically) about use of electric lights for this purpose. :-)
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