How did ancient greek architects create columns for their temples that appeared to be straight up and down

Might not help because im in elementary

Explanation:

Whilst some stone columns were carved in one piece, as buildings became bigger, columns began to be constructed from separate drums. These were individually carved and fitted together using a wooden dowel or metal peg in the centre of the drum.

Columns were carved of local stone, usually limestone or tufa; in much earlier temples, columns would have been made of wood. Marble was used in many temples, such as the Parthenon in Athens, which is decorated with Pentelic marble and marble from the Cycladic island of Paros.