These three water toys are designed to make patterns.
The first (fluid change) gently drips changing over the colours in the sections.
The second (bubbler) gently drips two different colours into the base of the toy.
The third (twin flow) pushes air through the liquid containing a white liquid which makes swirls in the coloured liquid.
All three toys produce beautiful and transfixing patterns.

Unfortunately these water toys finish quickly so it was difficult to take a photo.