27 minute show kinda long don't you think
Too many people have low attention spans ( Attention Deficit Disorder ) and I think 27 minutes is a bit long for a laser show. Just doing a 2 minute show with graphics can take hundreds of hours. How much work do you want to put into this ?
A mixture of beams and graphics would be good but again likely to get too much recycled sequences in a 27 minute show unless you have an extremely good Imagination and a creative mind to prevent boredom from setting in.
Good luck
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