We hesitated about whether we wanted to spend some...

We hesitated about whether we wanted to spend some of the little time we had in Edinburgh on such an attraction, but in the end we're very happy we decided in favor. The kids (ages 5-10) just loved it, but so did the adults! The camera obscura itself is just a 10-min show on the 6th floor, from where you have a great view of Edinburgh (with powerful binoculars set up to get a better look around). The show was interesting (basically a peep show of Edinburgh life through a series of mirrors and lenses displaying a live view on a white round table in a dark room), but what we liked most was all the various illusion exhibits on the several floors below. Definitely worth a visit!