City of Light also stacks with the Aesthetics finisher. Oh and, the Sistine Chapel only gives a +2 theming bonus. However, City of Light raises that to +4, and the Aesthetics finisher can increase it to the maximum of +8. The buildings and wonders housing Great Works only provide a base theming bonus equal to the number of Great Work slots. For example, The Louvre provides a +4 base, which becomes +8 with City of Light and then +16, the highest bonus in the game with the Aesthetics finisher.