Keys: arrow keys turn the drawing, shift and an arrow slide it, plus and minus move closer or farther, 0 returns to the readable LOGK view. Enter raises the next building. Three small architectural details open short explorations: a lit window, a seam between the towers, and a ribbed band. The Inspect button lists the same three by name. Escape or Back leaves one. The pause button stops the drawing's own motion. Sound is off until you turn it on with the sound button.