Why is Earth spherical?

 Ohr HaChaim (Bereishis 2:1) Heaven and earth were completed. I have heard from Torah scholars (who were my teachers) that the reason G'd made the earth spherical is to enable its various parts to endure with equal ease. The rabbis meant that of all the desires, urges and feelings of love in the universe nothing matches in intensity the urge of the spirit which has recognised the light of G'd and its desire to cleave to G'd's light. Every living soul which has been fortunate enough to recognise even a small amount of that light longs to behold visions of the pleasantness that is G'd. Know that G'd has endowed each category of His creatures with a two-tiered intelligence. One tier is the power to perceive, the other tier is the power to analyse. Human beings, i.e. creatures who are endowed with the power of speech, as well as all lower forms of life or even the inert part of nature, all received a degree of intelligence commensurate with their status in the universe which enables them to recognise their Creator. By means of this intelligence we know that the globe continues to exist without faltering. G'd has revealed some of this secret to those who revere Him and by means of these explanations these facts became translated to our senses  The force holding up the globe is G'd's beautiful and all-embracing light which surrounds the globe in equal measure. Every section of the revolving earth derives additional strength from the power of the fiery urge that burns within it urging it to cling to the manifestations of G'd's spirit. This is why the globe remains in its position in the universe.