It's not stated that you cannot. Which means you can. Anyway, as it is with most competitions, the winning works will be judged on several criteria and not just how well the shots are digitally enhanced.
What if The Hour Glass provides a selection of watches for keen participants to work with, at a designated venue, on selected days and each participant has 2 hours - will this help? Any better suggestions?
If Clubsnap members are keen, the shoot can be scheduled to take place only on designated Saturdays at a selected venue, and each shoot's duration is not more than 2 hours. You will need to provide your own lighting and set-up. The Hour Glass will provide some selection of watches. This is on an appointment basis and subject to availability. Please email fangning.lim@thehourglass.com
As for the other theme 'Conceptualising Time' you need not shoot any watch images as it is an abstract theme.
Do submit your entries early! The competition closes on 31st July 2007.