Final answer:
The columns of the temples in Greece are intentionally not straight in order to create an optical illusion and compensate for optical distortions. The Greeks incorporated design techniques such as column bulges and building curvature to achieve visual harmony.
Step-by-step explanation:
The columns of the temples in Greece are not exactly straight due to intentional design choices made by the Greeks. The Greeks wanted to create an optical illusion, where the building appeared straight to the human eye, even though it was not perfectly straight. The slight curvature in the columns and the adjustment in the shape of the building compensated for the natural optical distortions and made the temple appear straight. These design techniques, such as the bulge in the columns and the curvature of the building, were intentionally incorporated by the Greek architects to achieve visual harmony and stability.