I have read that the temple veil, torn at Christ’s crucifixion (Matthew 27:51, Mark 15:38, Luke 23:45), was woven with a panorama of heaven, and was about 3 feet thick, so that when it was torn that itself was a miracle. What if this is true, and then what does the symbolism mean for us today?
The information you received is not quite correct. The veil that separated the Holy of Holies from the Holy Place was not woven with a panorama of Heaven, but was woven with two dimensional images of the Cherubim (Exodus 26:31, 36:35; II Chronicles 3:14).
Furthermore, it was not three feet thick but it was approximately 4-5 inches thick. Even with that thickness it would require a divine miracle for it to be torn in half form top to bottom. If a man went in to do so he could only reach the bottom and tear it from the bottom to the top. But the tear began at the top and worked its way to the bottom which again indicates this was something only God could do.
Insofar as what the symbolism means, the basic meaning is that all believers now have direct access to God. During the reign of the Law only one man, out of one family, out of one clan, out of one tribe, out of one nation, and out of one race, ever had access to God’s presence, the Jewish High Priest, and even for him only one day in the year, the Day of Atonement. But now we can all enter into God’s presence if we have faith in the Messiahship of Jesus and do so on a daily basis.