What type of sound results from playing large groups of adjacent notes on the piano in a percussive manner?

The development of Gothic architecture seems to have been initiated by Abbot Suger at the Royal Abbey Church of ____________

Which church is this?

In which kind of stage is the acting area located at one end of the space with all of the spectators facing it?

a. Proscenium arch b. Thrust c. Arena d. Flexible space