Portal Test Chamber 16

This Test Chamber is the seventeenth level of the game, and introduces players to Turrets, and the ways in which they can be avoided or disabled.

Hazards

 * Cube Hazard
 * Turrets

Easter egg (alternate solution)

 * In the Rattmann den located behind the activated portalable piston surface, you can find block that should be in the wall that are on the floor.
 * You can actually transport the broken blocks through portals and drop them onto turrets.

This can be interpreted more as an Easter egg than a solution because it is not that practical because you can't grab the blocks or interact with them in any way other than moving them with portals. You can find more info on this phenomenon by checking the guide linked here.