For those unfamiliar with the Catholic Mass there is a minute or so period after communion for reflection and prayer. I've never been one for memorized prayer so I use that time to meditate. Also, read Exodus, the description of the Dwelling, basically a nearly square tent, wood sides with a sacrificial alter near the center. Not described is the roof of the tent, which would have to be peaked with a hole to let the smoke out. Our sanctuary was built on that concept with a shaft above the hole and topped by a skylight that could only be seen when directly underneath.
About ten years ago in church, after communion, during my meditation He came to me and told me what I was doing wrong and what I was doing right. It took all of about 5 seconds but a human conversation would have taken several minutes. He appeared as a sepia image on the inside of my closed eyelids and sort of an amalgam of religious art that I am familiar with. After it was over I sat down and said nothing, then my ten year old son tapped me on the shoulder and told me that he saw a cross come through the skylight and into my head. I therefore have a witness that I was given a vision.