To my understanding the Veil is thinning. However people and entities form other dimensions have been crossing it for, well, thousands of years. Dream walking, shamanism, astral projecting, seeing the fae, seeing spirits (ghosts), entities from other planes of existence.
I could think of a lot more important objectives to put all that energy into. But do as ye will, in that it harm none. IF you could accomplish this, for what purpose? To satisfy your curiousity? Is that a valid reason to possibly create a rift in the fabric?