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=== Date unknown === * [[Leon Battista Alberti]]'s ''[[De Re Aedificatoria]]'' (written 1443–1452 and published posthumously) becomes the first printed work on architecture. * From about this date, [[Leonardo da Vinci]] produces a number of designs for flying machines, including the [[:File:Leonardo da Vinci helicopter.jpg|aerial screw]] or [[helicopter]] (probably unworkable).<ref>{{cite book|first=Clive|last=Hart|title=The Dream of Flight: aeronautics from classical times to the Renaissance|location=New York|publisher=Winchester Press|year=1972}}</ref></onlyinclude>
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