[M.K.]

Every vertical structure with a ratio for height much more than the base dimensions for ergonomics average humans, those which are at least 10 times more in comparing how tall this average dimension is, independent for which use and objective human used or not they are, but everytime man made.

So for example 55% of humans have a estature of 1.75m, so a skyscraper for them would be every vertical thin structure more than 17.5m high or 20m to round the number.

For an ant those proporsions would be different in relative area. For them those South America in Pantanal big ants' nest are supertall, super skyscrapers in their eyes or the Burj Dubai of them.