Another optical illusion, where the brain manufactures an image that isn't really there.
Concentrate your mind on the cross in the middle, and soon you will see a rotating green spot appear - and at least some of the purple spots fade out of existence, often with green after-images.
Hat Tip, to the redoubtable and always readable Ninme
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Anonymous commenters - please add a signature (doesn't have to be your real name) on each post of yours. Anne O'Namus, Norm D. Ploom, Angry from Kent, Demosthenes, or even your real initials, it doesn't matter.
Commenters are expected to be polite to each other, but the same standard doesn't apply to comments regarding me.
Australian commenters are very very strongly advised to publish anonymously. Sydney alone has more defamation actions than the entire USA and UK. Nearly double that of the UK in fact.
As Google does not reliably inform me that a comment has been posted, and I have no control over first publication, I assert that all comments are innocently disseminated under the NSW DEFAMATION ACT 2005 - SECT 32 and similar acts.