DD4 saw this and couldn't wait to buy it.
We duly assembled the cardboard sheets into their allotted places
on the plastic base and added the sachets of chemical solutions.
Lo and behold, the plain cardboard has grown
snow, flowers and trees of delicate crystals, much to her absolute delight.
I envisage this is going to be a fixture on the
windowsill of my laundry area for a long time to come :-)