[Sebastian_09]

Warning for people suffering from trypophobia, some of the combinations can be quite disturbing! [0]

Very interesting how the patterns react to disturbances like rotation, and the animation is very smooth

[0] https://en.wikipedia.org/wiki/Trypophobia

[udp]

I usually have a very strong (feeling unbearably itchy) trypophobic response to anything "organic" that has clusters of protrusions or holes e.g. lotus seed pods, but none of these examples have any such effect. I think it's because of the bright colours and low resolution.

[hoppla]

Ditto, it has to be organic for me. Usually holes with stuff in it.

[jointpdf]

What about inorganic physical objects, like a shower head?

[udp]

No problem if it's inorganic. I expect there must be some kind of evolutionary reason for it - the fact that it's an itching/crawling feeling strongly suggests it has/had something to do with bugs.