video starts with "ground control to major tom"
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Tom was not a random choice. It relates to atom/adam which is "no more".
Regards monolith, don't lose sight of context. 1968 was not long after JFK "monolithic conspiracy" speech which was absolutely huge. The Monolith hilton was placed next to WTC for THAT reason. There is a big JFK link to monolith.
Also grays represent future genetic destruction.