Being stung as a child didn't put Leung Kam-hung off jellyfish - far from it. He has a fascination for the brilliant colours and graceful movements of the creatures and now has produced a set of glow-in-the-dark jellyfish stamps for Hong Kong Post. 'A jellyfish moves like a ballerina,' said the designer, who has produced two previous stamp sets. 'It is most attractive when it swims. We have captured a series of movements and show them on the stamps.' The stamps are the first to be issued in Hong Kong with a luminous effect, which was added after other effects were tried. It was decided that glow-in-the-dark designs would best illustrate jellyfish in their natural environment, which Mr Leung and illustrator Ken Wong spent two days studying at Ocean Park. 'We used silver embossing in the first design, but the post office suggested we use glow-in-the-dark instead,' Mr Leung said. 'And I think it matches [the surroundings] more.' The effect was specially applied when the stamps were printed in Australia, adding 20 to 30 per cent to the cost. Six species of jellyfish are depicted in the series, with the face value of the stamps proportionate to the size of the species. 'The six of them have their distinctive features and sizes,' Mr Leung said. He said he liked moon jellyfish the most because of its beautiful movement and its blueness, which matched the ocean. He also liked octopus jellyfish for their co-ordinated movements in large groups. Mr Leung said it was more difficult to design the jellyfish stamps than his previous two designs - one depicting butterflies and a stamp sheetlet to commemorate Hong Kong Post's participation in an exhibition in Bangkok last year. It was hoped the release of the jellyfish stamps could raise awareness of the need to protect the marine environment, he said. The designs of the jellyfish stamps were unveiled in September and reservations for the issue, which will be released on Thursday, are about 30 per cent higher than usual.