This content requires Adobe Flash Player version
or later.
Either you do not have Adobe Flash Player installed,
or your version is too old,
or there is a problem with your Flash installation and we were unable to detect it.
Aristóteles y Euclides escribieron sobre cámaras oscuras que ocurrían de forma natural como la luz que pasa a través de las minúsculas rendijas de una cesta tejida o los entretejidos de hojas.