It starts off easy: there's one big triangle, right? And then three definite triangles at the top. With it so far.
But then you notice that you can also make bigger triangles. And smaller triangles too. Suddenly all you see is triangles downwards, upwards, and sideways, and you no longer know what a triangle actually is, who you are or, more importantly, why humans are still allowed the internet.
Here's proof this puzzle messes with your brain: Even the consistently calm and collected world of Twitter is in meltdown.
Everyone got a different answer and no one showed their working. For example, this person somehow saw just 1 triangle.