The substance of being hollow

Thanks to uniform stress, a hollow tree doesn’t always mean a weak tree. This is worth considering if a client has asked you whether a tree should be removed because it is hollow or has a hole in it


As you read this, you’re probably sitting in a building with walls and hollow internal spaces called rooms. You could be in your work vehicle; a hollow structure with outside walls and an inside space called the cab. You may well be drinking from a cup, can or bottle; a hollow vessel. You push a wheelbarrow, drive a car, ride a bicycle - all connected to the ground with tyres; hollow rubber things filled with air.


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