New favorite imaging method: Schlieren photography, which captures turbulent heat waves. If you’ve ever seen a shadow from a candle’s flame or a BBQ grill, that’s the basic idea.
Above: the shock-waves from a T-38 fighter jet, below is a film of popcorn popping by Bell Labs (where I am artist-in-residence and who deserves the hat-tip for this) and heat from a gas grill.
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