Someone made tables out of classroom, where students are studying Mineralogy, and placed in two rows. In the tables under the glass there are various stones, they signed. Some of the stones are mixed, some are lost (of course, valuable breeds have been lost). The work has changed, replaced them with pebbles and broken bricks, or some crap like champagne corks, colored shard, buttons or a quill pen. Glass of one of the broken tables, the stones scattered around. At another table, towering brick walls, poured cement mortar. It happens when someone starts to build the Foundation, but then suddenly stops. The third table is empty. so the Clock hanging on the wall. The viewer can hear running seconds hand (then quieter, then louder, quiet, quite). School bell punctuated with the sound of breaking glass