Rav Hirsch on Pasuk 12 says that the ladder (the communication medium) was set up from the heaven to the Earth and was placed there deliberately (not by chance) by Hashem to the Earth. However, its primary purpose is not only from Heaven to Earth, but to allow the movement from Earth to heaven. That is the entire goal of (human) life on Earth is to work its way up to a heavenly high goal.
Rav Hirsch also says that he sees the messengers of Hashem going up to obtain the knowledge of the ideal and then come down to compare this ideal with what is actually found on Earth. Thus, it is determined how the angels must behave towards any particular human, based on how close to the ideal he actually comes.
A third point that Rav Hirsch brings is that Hashem is not at the top of the ladder but next to Yaakov. Yaakov sees all the forces of nature (using the term Elokim) having to go up to learn what to do and what the ideal is. However Hashem (Yud Hai Vav Hai) is actually there with him. He actually is there to nourish and develop the seed of kedusha on the Earth. Yaakov does not need to seek hashem in heaven, he finds Hashem next to him. We see just as with Hashem putting the Shechinah in the midst of the camp, that Hashem makes the pure human beings like the Avos the true
bearers of the Glory of hashem which wants to have its home primarily on Earth.