[Greek kalos, beautiful + eidos, form] n.
1. A tube-shaped optical instrument that is rotated to produce a succession of symmetrical designs by means of mirrors.
2. A constantly changing set of colors.
3. A series of changing phases or events: a kaleidoscope of illusions.
4. www.mirrorproject.com View Theme
So, you're surfing through the Mirror Project and you begin to see a trend? People taking their self-portraits in CDs? People with their pets? People visiting the same location? Sounds like a theme.