Design criteria for building in SL:
No elements, weather, climate or entropy
Illumination can be controlled by viewer
Gravity applies only to people, but mildly
People can fly and teleport
People can act upon objects remotely
Walls can be solid or traversable
Walls can be transparent, translucent, opaque or changeable
An opaque wall can be transparent on the other side
No energy can be expended to be conserved, yet people like to sit
There is no physics, chemistry or biology not counting attraction
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