Descartes drew
an equation for rainbows:
he invented analytic geometry
and applied it to beauty.

Something inexplicable
explained
but no more touchable and
tangible.

Descartes thought and so he existed: cogito ergo sum.
He willed himself to be tangible
so he could write equations for untouchable things,
like the hues between raindrops and the sun.

Descartes wrote
about the mind-body dichotomy, duality:
a body is a machine,
we age, we die;

but the mind has no such natural laws
so we see beauty in rainbows.

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Image: Susanne Nilsson