There is only one empty set in existence, and all references to the empty set refer to the same thing. All physical reactions to the empty set are reactions to the same thing. This gives the empty set characteristics of a physical object.
date
2023-06-25
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Shape (Wikipedia)A shape is a graphical representation of an object’s form or its external boundary, outline, or external surface. It is distinct from other object properties, such as color, texture, or material type. In geometry, shape excludes information about the object’s location, scale, orientation and reflection. A figure is a representation including both shape and size (as in, e.g., figure of the Earth).