If you think about a number line, multiplying 2 by -1 takes you to -2. Multiply it again by -1 and its back at 2.
If you think of the arrow from 0 to 2, all you did was rotate that arrow by 180 degrees to point along the negative axis and back again.
Multiplication by -1 is already a rotation of 180 degrees!
All were doing now is extending that concept to 90 degrees by imagining a second line perpendicular to the original number line.
Two 90 degree rotations need to get to -1 to complete the 180 degree rotation we already expect in normal multiplication.
Giving it the symbol i, this means definitionally i * i = -1. It has to because -1 flips us around the other way on the number line.
That means i is the square root of negative 1.
Any values that use i to store information, even time, could be called "imaginary time". Really it's just constantly oscillating between the real and imaginary spaces like a constantly spinning arrow.
What? There aren't any?
If I explained to you ghettos are horrific and violate human rights, because as one example among so many other issues we would likely agree on, they strip a people of their right to fair elections and representation in the determination of their future.
And that the fact that Palestinians have not been free to organize, form new political parties and campaign in safe and uncoerced elections is a direct violation of their rights and the party to answer and blame for this is the one occupying them and preventing this from happening...
What are we disagreeing about?
What I disagree with is that an election an entire generation before the present that people alive never voted in should not be held up to represent their current politics and beliefs as a nation.