This scene looks downward from the outside of a Kaleider Carousel Room, which is covered with a Corner Slot Rectangular Mirror Pattern.  A different source image was used to create an Equilateral Triangle (Split) Kaleidoscope pattern on the Bubbles.  The pattern on either the Room or the Bubbles can be 'frozen' so that it doesn't change, which allows you to pick a particular pattern for one, 'freeze' it, and then experiment freely with the other.