Zambia Iridescence - Barry Thorley captured this near sunset iridescence at Kasompe Airfield, Chingola, Zambia. Iridescence, a diffraction phenomenon produced by small droplets in clouds, can be very transient or long lasting. It is often hidden in the sun's glare and is best searched for by shielding the sun and using sunglasses or reflecting the sky in a dark mirror.   ©Barry Thorley, shown with permission.

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