Four hands is two women from the roster booked together: a lone guest pays the hour twice over, a couple four times over.
Galleries sometimes hang two works as a diptych, meant to be seen as one. Four hands is the roster's diptych: two portraits reserved as a single booking, arriving at the same door at the same time. Not every woman on the wall accepts pair bookings. Seven do, and their profiles say so: Bianka, Karolina, Lucie and Nora, along with Danielle, Lea and Milena. The four-hands page sets them out next to one another.
A guest can name both women, or name one and ask in the booking conversation which of the other six she is happy to work alongside. Each woman decides for herself whether she takes a pair booking and with whom, so that answer is hers to give. Mixed pairs are common on the wall, Lucie with Karolina or Danielle with Lea, each pair bringing two different sets of languages into the room. When one half of a named pair is not free at the requested hour, the reply says so plainly and offers another time, or the names of those who are free then, and the guest picks. Nobody arrives under a name the guest did not agree to.
For a single guest the hourly rate doubles, and it scales cleanly with length: two hours with both women cost what four hours with one would, and three cost what six would. A couple sharing the pair pays twice that again, so each hour of theirs is worth four single hours. Two therapists arriving together is one of the seven classes that carry a deposit, so every pair booking is confirmed with half of its fee, whatever its length and however many guests share it, with the other half paid in the room. Both women keep those hours free once they have said yes, which is why the half is asked whatever the notice.
The pair can stay the night as well. Eight hours with two women are charged as eight full hours at the pair rate, with no reduction for the night, and a couple pays double that; half goes first in both cases, and each of the seven profiles prints those lines in its rates table.
What a cancelled pair booking costs follows the notice given, as set out under deposit, and the journal on the geometry of four hands looks at how a pair divides the room.