BUR #38661 is pending approval.
create alias everything_is_cake_(meme) -> illusion_cake
Most of the images in this tag are not referencing any specific meme (aside from this one, which I can't find the name of) and are simply just depicting illusion cakes.
As someone that has recently binge-watched The Great British Bake Off and Is It Cake? (don't worry, I will make sure to upload some anime dakimakuras of Paul Hollywood soon), I can confirm that the entire concept of illusion cakes is not inherently a meme.