The Parthenon is a temple on the Athenian Acropolis dedicated to the goddess Athena. Construction began in 447 BC and ended in 438 BC under the architects Ictinus and Callicrates. The temple has a conventional three step platform and a rectangular floor plan with a pronaos, opisthodomos, and inner sanctums. Inside, sculptor Phidias' large statue of Athena stood surrounded by columns. The Doric columns have optical refinements to appear straight and the marble roof tiles are thinly sliced to be translucent. The Parthenon exemplifies the refinement and precision of Greek architectural design and order.