Rivers of Venice

I had a dream the other night that I was in a very large building that was patterned after Venice; corridors filled with water, ankle to waist high. The rooms and passages were open, with broad stone stairwells and arches.

I happened into a classroom where a man had a holographic type chart, like a massive chalkboard made of clear water. And in it was mapped the galaxy, with things numbered and named. He explained to me that the arms of the galaxy were like rivers and he was naming them. Rivers and streams.