I can tell because of the vapor trails.

Spaxels:

Previously, previously, previously, previously, previously, previously, previously.

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2 Responses:

  1. Pavel Lishin says:

    I wonder what you could do with a couple of quadcopters spraying some sort of mist or fog, and another one in the middle of that using lasers to paint a scene.

  2. Line Noise says:

    I wonder how many UFO reports the authorities received that evening?