The people argued that they needed a God to go before them on their journey. Aaron gave in and made a miniature version of a bull out of gold. The people's attitude towards this creation of man was that it represented their gods. But Aaron's attitude towards this image was that it was Jehovah Lord. Perhaps he thought it represented God's strength, but the comparison was inferior.
Images mislead the worshipper.
The result of the feast of the people to their gods was an orgy that violated most of the other commandments that God was giving to Moses. We must be careful because we become like what we worship. We need to take time to discover what God is truly like and worship Him as He is. He became filled with pride and decided to worship God in a way of his own choosing. But after Uzziah became powerful, his pride led to his downfall.