I'm in a room that is all white, empty except for a white bed. Alona comes in with a dark blue dry-erase pen and starts drawing on the wall. First she draws parallel horizontal lines, which I think must be the ribs of a life-sized skeleton, but then she draws shorter likes on the other side, tilting a little the other way, like the ribs are shorter on that side. Then draws more lines haphazardly between and among them. Finally I ask her what she is drawing. "The sea" she responds, perhaps as though it should be obvious. She tried filling it all in with horizontal lines, but they still look like haphazard lines.

"I can draw a sea," I say. I think that the perspective should be easy; the horizon should be an almost-straight line that just tilts down a little on the ends, as the earth curves. The front part should have some details. But I try to draw it, and the perspective looks terrible.

Without even planning it, I sketch a range of mountains behind the sea, and they look awesome! I can't believe I did that with just a couple strokes of the pen. But it doesn't make any sense with the sea there. I want to erase the sea, and a couple of colorful butterflies that somebody drew down at the corner of it. I pick up a whiteboard eraser, and pull it across, but it doesn't erase. The wall is textured, and tears the eraser.

Natasha is there, I think in the bed, so I ask her how to erase this. She says it can't be erased, you have to sand off and repaint the wall. I had no intention of it being permanent or causing a lot of work; I thought it was just like a big whiteboard.