One tends to associate mirages with deserts and other landscapes extreme heat so it might be a bit surprising that it’s actually very common to see islands floating above the horizon on a cold frosty winter day.
Yet just as long as there are still large enough patches of open sea the temperature difference between the frosty air and the open water helps to lift the farther islands and buyos (and ferries and other vessels too) up in the air,
sometimes offering obscure glimpses
of objects almost beyond the horizon.
The Tallinn ferry taking off up in the air, probably all unawares of having turned into an aerial ship…