Hi Catherine, Alek,

Here's the black coffee.

1 without anything

2 with a twist

3 two with some bubbles and twist

I think something has to be done otherwise it will be very boring.

Even in black coffee, something always happens during brewing.

These are about the maximum possibilities for something to happen in the cup.

Black coffee without movement or bubbles.

Black coffee without bubbles with twist.

Black coffee with bubbles and twist.

Black coffee with bubbles and twist.