I recently read an interview with one of the website creators and it was fascinating: the basic premise is to reason about physics from the perspective of what

I recently read an interview with one of the website creators and it was fascinating: the basic premise is to reason about physics from the perspective of what is impossible/fixed. The example given in the interview was relativity, which arose when Einstein asked the simple questions “what if c IS fixed?” (it was an open question at the time) and “what if only light can travel at c?” Mathematical treatment of those questions led to SR and SR led (eventually) to GR. It’s an intriguing approach: posit a fixed limit or impossibility and see where the math takes us (inventing/applying new math as necessary). Some avenues will be useless, others may be fruitful.