How can one acquire a language just by listening without the visuals?

Question

I have watched Stephen Krashen's talk on language acquisition.

And I learnt that according to decades of research and experience, the best way to pick up a new language is to acquire - just like children do - via comprehensible input.

This works great when interacting with language partners / parents, or when watching videos online where one can see things being shown or pointed at.

My question is:

• How can one acquire a language when watching or seeing is not an option?

Answer 1

One of the popular methods of audio-only is Pimsleur Method. Instead of visuals, it uses explanations in L1. Quite effective, IMHO.