Theater Eroika was pure folly on my part. Imagine if you will, five moveable wheels which the reader could crank through slots in the outer shell. The outer shell contained a window through which you could see one of up to 24 panels printed on the wheels below. Wheels contained windows as well so that you could see the panels on the wheels behind them. And on top of all this, the story was branching!
Originally, I planned to mass produce Theater Eroika and assemble them by hand. However each unit required 113 individual cuts. Earlier prototypes featured bars that slid along troughs. This gave way to wheels as they only had a single friction point. Friction between the wheels, however, proved to be too much of a problem and the project was finally scrapped.