k history, praised (both for his artistic talent and his brilliant mind)He always
carried a notebook with him, which he flled with notes, sketches, and
(ポ
diagrams.
His notebooks contain ideas for such inventions as the scaling
Jadder, rotating bridge, submarine, amored vehicle, and helicopter,( 13 )
is known to have been built until decades or centuries later.
Leonardo
passionately observed the natural world around him, seeking to find out how
things worked in order to draw more accurately. He discovered that the