Is it sleep deprivation or do the disks actively change colour and swap places?
I think this must be a low light optical illusion - something to do with different sensitivity in center of eyes vs peripheral. Will try again in the daytime.
I definitely noticed that effect (it's late here as well) - I found it necessary for the last couple to look at the center of the triangle rather than each dot in turn.
I think this must be a low light optical illusion - something to do with different sensitivity in center of eyes vs peripheral. Will try again in the daytime.