Yet another lull, internet issues a World War 1 commemoration project, a friend's grief . . .
So again here goes . . .
Sian suggested I go with my heart when choosing a selection of images to work with and take my colour scheme from there: ice-blue, cool light grey, dark grey and warm browns. A feeling of depth and shadow contrasting with lightness and a gleam on edges was something that also struck me about these images. There is a sense of mystery attached to spiral staircases, echoes of T.S. Eliot, though I've yet to find the exact quote I think I recall.
On closer examination I also saw deeper shades of petrol blue and copper and gilt tints. The image below shows a colour matching exercise where I tried to find exact colour matches in magazines and then by mixing acrylics and water colours. Water colours gave a nice translucence and a bronze metallic rub-on provided the gilt.
Sian also asked me to notice how each example uses spiral in a slightly different way. So following an internet investigation and discovering a world of (at least to me) advanced maths I'll start with the University of East Anglia spiral staircase from one of my Photo-shopped images -- this is an Archimedes spiral, a 3D spiral on a vertical plane, the spiral travelling counter clockwise. All the rotations are the same size.
The three other spiral staircases are also examples of Archimedes spirals, and 3D on a vertical plane. They differ, however, in respect of the size of each rotation -- some large to small, others small to large.