Wow! This is legal, constitutional and political dynamite.
It is worth just taking a breath and considering that a prime minister of the United Kingdom has been found by the highest court in the land to have acted unlawfully in shutting down the sovereign body in our constitution, Parliament, at a time of national crisis.
The court may have fallen short of saying Boris Johnson had an improper motive of stymieing or frustrating parliamentary scrutiny, but the damage is done, he has been found to have acted unlawfully and stopped Parliament from doing its job without any legal justification.
And the court has quashed both his advice to the Queen and the Order in Council which officially suspended parliament.
That means Parliament was never prorogued and so we assume that MPs are free to re-enter the Commons.
This is the most dramatic example yet of independent judges, through the mechanism of judicial review, stopping the government in its tracks because what it has done is unlawful.
Be you ever so mighty, the law is above you - even if you are the prime minister.
Unprecedented, extraordinary, ground breaking - it is difficult to overestimate the constitutional and political significance of today's ruling.