Open your eyes.

Spit out the coarse mud that fills your lungs.

Come to.

You see, the moving tower was only a rough patch.

Take a few moments to unwind in the pool in front of you. Of course, it is sea water. It can be found under any sand castle if you dig deep enough. This is why the pool had to be in the foundations.

But do not take too long. There is not much time left.

The water is rising, softening the edges of the pool: the walls seem to shrivel. Something is rumbling just behind them.

Already the sea?

You knew it had to come sooner or later.

It is she, the final visitor, she who approaches you in the pool, who turns the ground spongy and slippery underfoot.

Every sand castle has a channel.

Every sand castle contains the seeds of its own demise.

Before the slowly buckling ceiling merges into the floor and absorbs you, try to wade over to the little door that is about to give way, at the other end of the room.

There is still something left to see.