What happens if we try the cross on the other side?

If we're used to starting a particular figure using the left leg, what happens if we start it with the right leg?

If we usually start a particular figure by turning one direction, what happens if we start by turning the opposite direction?

This is a dance that was built from experimentation, not by pre-determined rules.

Although lessons and workshops are a great place to learn new tango steps, at least half of our learning happens outside of the class environment. We don't need permission to try something out on our own, or to modify a step we learned elsewhere. 

We don't know what will happen if we try this or that. Maybe it'll work, maybe not. Since tango is built from experimentation, being wrong is part of the process that moves things forward, not backwards.