1401-1464 1404-1472 1893- 1902-1999 20thcentury 850 architects authors autobiografie biography childhoodandyouth correspondence cossío criticismandinterpretationalberti dramaticworksalberti families familylifeeducation history italy josémaríade knowledge leonbattista nicholas nikolaus perspektive rafael renaissance spanish spanishauthors theoryof vision visualperception youth ästhetischewahrnehmung