Side view of an empty freezing chamber developed at the Max Planck Institute in Hannover, Germany. The copper base measures 5 x 5 cm. Four individual transparent side walls are made of plexiglas. At the lower edge, the plexiglas side walls are beveled and on their top edge they have two protruding stainless steel pegs. Stainless steel rods, one at each corner of the copper plate, hold an aluminum top bracket in place. The aluminum top bracket contains holes that accommodate the pegs of the side walls. Plexiglass walls are mounted by first fitting their beveled edge into grooves in the copper base, followed by maneuvering the aluminum top bracket onto the pegs. The aluminum top bracket is fastened to the four rods with a pair of clamps.