Noah's Ark ark could contain all the animals in the world, argued that Moses, the traditional author of the book of Genesis, had been brought up in Egypt and would therefore have used the larger Egyptian cubit. He also fixed the shape of the ark as a truncated pyramid, square at its base, and tapering to a square peak one cubit on a side; it was not until the 12th century that it came to be thought of as a rectangular box with a sloping roof. Early Christian artists depicted Noah standing in a small box on the waves, symbolizing God saving
Noah in rabbinic literature (the book from which the angel Raziel taught Adam all the sciences), which had been brought to him by the angel Raphael. The construction of the ark lasted fifty-two years; Noah purposely working slowly, in the hope that the people would take warning therefrom and would repent (Pirke De-Rabbi Eliezer l.c.). The "Sefer haYashar" (l.c.), however, assigns only five years for the construction of the ark. Noah could distinguish between clean and unclean animals inasmuch as the ark of itself gave admittance to seven of the clean animals, while of the unclean ones it admitted two only (Sanh. 108b). The