This depicts a typical “milonga” scene, thought there are usually lots of couple on the floor. In this case this pair are demonstrating their style of tango.
There is always an intense, sensuous atmosphere in these dance venues when t"angueros" gather to socialise and lose themselves in the dance. The combingation of the culture, music and sensuality is a mysterious, magically charged blend.
I have played with this a little in Photoshop, something I’m still quite tentative about, given that I don’t know many of the finer points and techniques of using the programme! Comments are welcome