Final answer:
The Spear Bearer (Doryphoros) and the Parthenon exemplify the Greek classical mindset through their emphasis on ideal proportions.
Step-by-step explanation:
The similarity between the Spear Bearer (Doryphoros) and the Parthenon that exemplifies the Greek classical mindset is ideal proportions. Both the sculpture and the temple demonstrate the Greeks' pursuit of perfect beauty and harmony in their artwork. Doryphoros, created by the sculptor Polykleitos, sought to achieve ideal proportions in the human form, while the Parthenon's architectural design employed precise mathematical calculations to create a visually balanced and proportionate structure.