And very delicate. And a mirror like that can become a missile. Test it out. And, again, it took all day long just to set up the photograph, in addition to taking at least half a day just to physically get the mirrors and the sandbags and the stands and all the things that you need. We had to brace these mirrors and tape them down.
Safety is a major preoccupation.
You don't want to do something like this and have somebody get hurt. Especially the most famous astronomical duo you know, currently working in the field. You don't want to do that. And they came up and they were incredibly gracious. Really wonderful people to work with.