Inspiration behind the composition?

On an emotional level, the memory of a BBC news report on Ireland's legalising same sex marriage. Two women were being interviewed, saying the law change made them feel they could walk down the street holding hands without feeling shame.

It's an irony that people try to dictate what it is to be human, when our DNA is roughly 7% viral and if you're of Northern European descent, you've a bit of Neanderthal too. Beings with 100 billion neurons aren't so easily pigeon-holed into monochrome classifications, no matter how much our primate, pack influenced thought patterns distrust change and difference. Perhaps that's why the multicoloured flag suits the LGBTQ+ community so well.
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To create the colour effect, I used the RGB Critter torch, programming in the rainbow colour palette with a timed transition from colour to colour. This was shone through a custom black fibre optic brush which was brushed around the contours of a female black mannequin head to shape the light.

Camera settings: Bulb mode. A 23 second exposure at F5.6, ISO200.