I've written
in the past about sunlight reflecting off windows in a concentrated fashion leading to damage on neighboring houses. That however, is small stuff. The MGM Mirage Vdara Hotel in Las Vegas has built more or less their entire building into a concentrating mirror. Look at the picture of the building:
and don't tell me you're surprised that there is a problem.
According to The Register,
...an employee confirmed: "Yeah, we know. We call it the death ray."
The strange thing to me is that they seem perplexed about the solution.
[The Hotel's spokesman] explained that there's no easy fix for the problem, since the hot spot will shift according to the season... He said: "This is quite literally an astronomical challenge. We are dealing with a moving target."
Predicting the path of the beam can't be too challenging. The analemma was known to the ancients, and the rest is geometry, right?
and don't tell me you're surprised that there is a problem. According to The Register, 
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