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Put down the first finger at the righter top, dragged it down a bit. Then put
down the second finger on the lefter top, and dragged both fingers down
a way. Then I first took the right finger off, kept dragging a bit more
downwards with the left, and then also took that one off.

And did so repeatedly towards the middle of the screen.

If you look carefully, you can see not onle that a single line consist of
two, but really three colors! The third colored blob at the very bottom
appears the moment I start over with new lines towards the middle (as
consistently represented by the color).

Also, on the first iteration the left finger does not appear until I
raised the right finger.

Can I do anything else?

regards,
Cedric