Challenge has finished
In this challenge, show us examples in nature of subjects which are hollow. This might be a giant log which has become hollow through old age and decay, lava tubes, ice caves, or it may be something very small, such as marine tubeworm shells, bamboo, dried grass stalks. Macro and close-ups welcome. Where possible, the subject should be outside in the natural environment. SIZE: 1,600px MAXIMUM ON LONGER SIDE.
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Saturday, 5th April, 2014 (GMT)
Saturday, 12th April, 2014 – Friday, 18th April, 2014 (GMT)
Saturday, 19th April, 2014 – Friday, 25th April, 2014 (GMT)
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Maximum number of entries per user:
Maximum number of entries in challenge:
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