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Watch the BBC first on iPlayer ๐Ÿ‘‰ https://bbc.in/iPlayer-Home More about this programme: http://www.bbc.co.uk/programmes/b03njv9h The panel try out some optical illusions.

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All our TV channels and S4C are available to watch live through BBC iPlayer, although some programmes may not be available to stream online due to rights. If you would like to read more on what types of programmes are available to watch live, check the ‘Are all programmes that are broadcast available on BBC iPlayer?’ FAQ ๐Ÿ‘‰ https://bbc.in/2m8ks6v.