The weekend wasn't all Star Trek. The TELUS Spark Science Center also has interactive rooms on science, nature, earth, human physiology, and more. At this point in my trip, my brain was on "shiny, pretty" mode and I was not up for complex thoughts. The water jars drew me in. Dozens of them were filled up by people, dated, and then left on display by the windows to show how the color prisms change over time.
Even on this snowy, cloudy day, the light was reflecting differently off the water in the jars. No additives, only water and any minerals that are in the water, time, and light.
That's all. Enjoy.