I've been playing around with Photoshop, trying to find ways to create those reflecting, kaleidoskopic images without manually resizing and rotating images. This was eventually achieved by using embedded images - there is an origin file, one that is cropped to a triangle, one that reflects the first triangle and the final image, which combines the triangles in a hexagon. Voilá, now I only needed to swap the origin image and the final file would update. This enabled me to play around with many different source images. In a second step, I combined two images with different scales and even added some transparency.
This is the "Cathedral" series.
Man, gothic arches are really neat for reflective geometry! It really lends itself to hexagonal works, sometimes it's hard to tell if the resulting arches and spires are from the original image or from the mirroring.
Kaleidoskope - Cathedral I
Taken from the arches of the Sagrada Familia, outside.
Kaleidoskope - Cathedral II
Taken from the cathedral in Cologne.
Kaleidoskope - Cathedral III
Kaleidoskope - Cathedral IV
Taken from a view up in the Sagrada Familia. This architecture is mind-blowing even without reflections, but it's more flowery this way.
Kaleidoskope - Cathedral V
A baroque church for good measure. Dizzying, and almost, maybe could have been built like this!