The cult statue was often oriented towards an altar, placed axially in front of the temple. To preserve this connection, the single row of columns often found along the central axis of the naos in early temples was replaced by two separate rows towards the sides. The central one of the three aisles thereby created was often emphasised as the main one. The dignity of the central aisle of the naos could be underlined by the use of special elements of design. For example, the oldest known Corinthian capitals are from the naoi of Doric temples. The impressiveness of the internal aisle could be emphasised further by having a third row of columns along the back, as is the case at the Parthenon and at the temple of Zeus in Nemea. The Parthenon naos, also had another impressive feature, namely two tiers of columns atop each other, as did the temple of Aphaia on Aegina. The temple of Athena at Tegea shows another variation, where the two column rows are indicated by half-columns protruding from the side walls and crowned with Corinthian capitals. An early form of this solution can be seen at Bassae, where the central column of the back portico remains free-standing, while the columns along the sides are in fact semi-columns connected with the walls by curved protrusions.