@kimlockhartga@beige.party @MennoWolff@ohai.social @wonderofscience@mastodon.social @SteveClough@metalhead.club The concentric circles illusion doesn't move for me; but on the grey background the circles look very different to me compared to the identical circles shown on the white background. On the grey background I am unable to see them as distinct concentric circles; they somehow interfere with each other. Whereas on the white background they appear clearly separate and concentric.