Genèse 11:4

And they said, Come, we will build us a city and a tower, and the head of it shall come to the summit of the heavens; and we will make us (an image for) worship on the top of it, and put a sword in his hand to act against the array of war, before that we be scattered on the face of the earth.

הבה נבנה לנו עיר, according to the plain meaning and the commonly held opinion that the people of that time were punished for their grandiose plan of building a Tower which was meant to reach the heaven, what are we to make of Deuteronomy 1,28 in which Moses described cities of the Canaanites as having walls as high as the heaven? Why were these walls not destroyed by G’d? We must revise our opinion of why the people were punished, and accept that their principal sin was in not fulfilling G’d’s basic directive to be fruitful, to multiply, and to populate the whole earth, not just a small valley. Their declared objective had been not to scatter (verse 4) The fact that G’d forcefully scattered them afterwards shows that their sin must have been their failure to do so voluntarily.

ויאמרו הבה נבנה לנו עיר, this was at the advice of their leaders who wanted to enthrone Nimrod as king over the entire human race,

ומגדל וראשו בשמים ונעשה לנו שם, the meaning of the words נעשה שם, is a metaphor for “let us make a supreme idol.” This idol was to be placed on top of the Tower. They hoped that the visibility of the Tower and its symbol on top would ensure that they would be most highly esteemed among people all over the world, regardless of whether such people had become part of their city-state. Anyone ruling their city, would automatically be recognised as the ruler of mankind.

ויאמרו הבה נבנה לנו עיר, the purpose of the city was residential, the purpose of the Tower was to serve as an observation tower enabling the people in the city to keep track of where their flocks and herds were grazing. It would also serve as a beacon for shepherds who were far away to find their way home by focusing on the Tower.

וראשו בשמים, an exaggeration describing that the Tower would be very tall. We find a similar exaggeration when Moses described the walls of Canaanite cities in Deuteronomy 1,28 as “reaching into heaven.”

ונעשה לנו שם, they meant that as a result of having a permanent residence instead of being nomads, they would acquire a far greater reputation of being people to be reckoned with. If they were to travel, and when asked would refer to this city as their home town, this would impress people over the globe. Not only that, the fact that the traveler himself compared his home town with whatever other town or settlement he would encounter, would remind him of his home town comparing favourably with the place he had just visited, and he would be sure to return home. It would act as both a physical and psychological magnet to draw the traveler back home.