AmexRuislip
Retired Spy 🕵️♂️
http://www.bbc.co.uk/news/science-environment-37337778
How many dots can you see in this optical illusion?
My eyes are now knackered
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12 fairly easily - but I've got very poor colour definition so that may actually be helping for once.
24, but only because you seem to have posted it twice?
15 ......5 on top line and 5 in the middle line and 5 on the bottom line