Instability in the sink

Yesterday at the lab I was intrigued to find regular patterning of ink in the most unexpected places – at the sink, whilst cleaning up between experiments using perspex sheets. Luckily my camera was still close by .. here are a couple of examples:


‘Making tiny waves’ – I think this patterning is called Kelvin-Helmholtz Instability – will check with those who know later on this week!


Ink dropping from a height and forming regular patterning

These striped patterns seemed remarkably well-defined and stable, like marbling.

Below are some natural textures formed using perspex:




Ferns and fronds


A slice of agate

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