Obstacles - "Bor"

"Bor" as a central form of Damage: Bava Kama 2a

One is not considered the owner of an Obstacle dug in public property, except under the Rabbinic designation for liability: Pesachim 6b-7a

Obstacles are Dangerous from the start: Bava Kama 4a, 5b, 9b

An Obstacle is expected to become uncovered spontaneously: Bava Kama 9b

An Obstacle of 9 Tefach [Hand-Breadths] qualifies as a Central Form of Damage, although only for damage, not for death: Bava Kama 3a

Liability for Death/Damage if one dug only the 10th Tefach [Hand-Breadth] of the Obstacle: Bava Kama 10a-b

Where people or vessels fall into the Obstacle, as opposed to where an animal falls in: Bava Kama 5b, 10a; Bava Metzia 27a

Where a hidden item is damaged [such as a bagged item on an animal]: Bava Kama 10a

The Off-Shoot forms of an Obstacle's Damage have the same legislature as the Central Form: Bava Kama 3b

One doesn't pay for an Obstacle's Damage to an Eved: Bava Kama 9b

One doesn't pay Extra "Kofer" Compensation for Damage done via an Obstacle: Bava Kama 9b

Payment for damage caused where another animal pushed this one into the Obstacle: Bava Kama 13a-b

"Obstacle Damage" refers to Damage which can[not] be expected via the damaging object, which is his personal property and is upon him to protect: Bava Kama 3b, 6a, 6b, 9b, 10a

Damage from an Obstacle for which an individual maintains ownership, and which he left in a public area, is liable either under the rules for Obstacles, or possibly under the Damages of Animals ["Shor"] - Goring, Eating, or Trampling: Bava Kama 3b, 6a

Liability exists even if the owner Renounced Ownership of the Object in a Public Area: Bava Kama 6a

For an Object which fell from a rooftop in an ordinary wind, responsibility is learned from Obstacles and Fire: Bava Kama 6a

For an Obstacle which is rolling in a Public Area, responsibility is learned from Obstacles and one of the sub-categories [Goring, Eating, Trampling] of Animal ["Shor"] Damage: Bava Kama 6a

Where cleaning out his Trap or Pit into a Public Area at a Permitted Time, and someone is hurt from the resultant stationary obstacle, Responsibility is learned from a combination of Obstacle Damages and Animal ["Shor"] Damage [Goring, Eating, Trampling]: Bava Kama 6a-b

If a Person's Wall or Tree fall into a public area, after he has been given ample warning, Responsibility is learned from Obstacle Damage and Animal ["Shor"] Damage [Goring, Eating, Trampling]: Bava Kama 6b

Liability for damage done to Invalid Offerings which were Redeemed: Bava Kama 10a

A person's rock, knife, or burden which he leaves in a public area: Bava Kama 3a

One's barrel which broke in the road: Bava Metzia 82b

One's camel which fell in the road: Bava Metzia 82b