While optical illusions often have a mind-bending effect on me, I’ve never given much thought to how they affect our furry friends – but of course, someone on the internet has. Testing their feline pals with a crafty optical illusion doormat, this YouTuber quickly realised that their moggies weren’t as easily fooled as we might expect.

There are countless types of optical illusions, from the cognitive to perplexing physiological tricks of the eye. A prime example of the classic anamorphic illusion style, this mystifying op-art has been a favourite among optical illusion fans for decades – I guess cats just don’t have the same artistic appreciation.