The Tyson link is a GREAT link into understanding dimensions and inspires insight into picturing the shape of our curved space universe. This link makes quick work what took me years to piece together after I had an unusual sighting in Rochester NY.
Its taken 40 years but I can now visualize a hypercube easily.

aside:
I always felt this was an open universe but evidence is working against my initial early guess.

Right now I am thinking about imaginary time in a early universe where gravity and density does not allow for normal time as we know it now. Its a different way of expressing inflation theory.

ps My new lap top has me amazed how much easier it is to text.