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.
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2023-06-25
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Tunguska event (Wikipedia)The Tunguska event was a large explosion of between 3 and 50 megatons TNT equivalent that occurred near the Podkamennaya Tunguska River in Yeniseysk Governorate (now Krasnoyarsk Krai), Russia, on the morning of 30 June 1908.