We had the most amazing sunset skyscapes last night complete with a rainbow. So this is my latest threshold, that of day and night.
Not such a good one of the rainbow, the threshold here is the visible spectrum part of a much greater continuum we cannot see in either direction.
Graham has been to: Austria, Belgium, Botswana, Switzerland, Czech Republic, Germany, Denmark, Estonia, Spain, Ethiopia, France, United Kingdom, Gibraltar, Gambia, Greece, Croatia, Hungary, Italy, Kenya,Cambodia, Liechtenstein, Luxembourg, Malawi, Netherlands, Qatar, Rwanda, Slovenia, Slovakia, Senegal, Thailand, Turkey, Tanzania, Uganda, Vatican, Vietnam, Zambia, Zimbabwe.
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Tanza-Longs 
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