the 4th dimension

What is time? Is it the measured interval between events? Is it a continuum in which incidents occur? Is time immutable and irreversible? Is time the quantitative measure of a moment or an era? Is time a dimension? Is it all of these and more?

This is the course description for a Wintersession class called Timely Journeys. I am intrigued by how time is the 4th dimension, how to construct time without using a time based medium, and how to work with sequence and chronology to create connections between fragments.