I was tasked with figuring out how water had been smuggled into a boarding school where it was explicitly disallowed. I discovered that a “water specter” had been bringing in buckets of hydrogen and buckets of oxygen and mixing them on the premises.

This dream illustration in ballpoint pen, and over 120 like it, can be found in print form in my Book of Dreams (and Nightmares): Volume 1, available from Amazon (https://www.amazon.com/dp/1548199664).