They spray to hide the construct for one thing so can you see what they are trying to hide?<br />Some type of object? What you see in the sky is a reflection from below.<br />Accralate - The Dark Contenent by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="nofollow">https://creativecommons.org/licenses/by/4.0/</a><br />Source: <a href="http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100341" target="_blank" rel="nofollow">http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100341</a><br />Artist: <a href="http://incompetech.com/" target="_blank" rel="nofollow">http://incompetech.com/</a><br />...<br /><a href="https://www.youtube.com/watch?v=N38DxQcZG_Y" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=N38DxQcZG_Y</a>