I chose this side.

The side with a table, a lamp and a collection of printed skeletons. The side where a drawing was a drawing and imagination could borrow from what I had seen.

I wrote it inside the door.

The notebook stayed still.

For the first time, I understood what the objects had given me. Not proof of another world. A way to notice how quickly I filled a gap, chose a role, invented a history.

The bones were real subjects. The alternative forms were mine to imagine. Keeping those things distinct hadn't made the story smaller. It had given me something solid to push against.

I turned to the beginning and drew the Tyrannosaurus again.

One shadow this time.

Beside it, I drew the winged version on a separate sheet. No pretending. No discovery announcement. Just a possibility I wanted to see.

Then I noticed the handwriting.

Every small note in the notebook used the same odd shape for the letter g. The same one I had used in an old sketchbook. I found the sketchbook and compared them.

Mine.

The first mystery closed there: the clues had come from my own marks, ideas and assumptions. I had been following a trail through what I made.

Whether the strange familiarity meant anything beyond that remained a question. The Archive called it an echo. It didn't claim an answer.

I closed both books.

When I came back, a loose sheet lay between them. A drawing of my table, viewed from the other side of the door.

The skeletons were there. So was the notebook.

The chair was occupied.

I couldn't see the face.

I could see what it was drawing.

It wasn't a dinosaur.