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Why would event buildings of the same size that provide nothing but culture, have different values? The event doesn't increase or decrease the chance of winning, so it simply serves as a penalty to those who prefer one look or another, with no meaningful choice. If there is a tradeoff between population and culture, that's fine. But why should the crystal unicorn offer a few more culture than the silver one, or the leaf codex less than the observatory. This is an inexplicable bonus or penalty to people for their esthetic choices.
If special residences were made a different color, but offered fewer population while being otherwise identical, no-one would ever choose the ones that offer less population. Why does anyone involved in design think it is a good idea to have prizes of identical size with different cultural values? If all prizes that are pure culture and the same size offered the same culture/square, then people could make true esthetic choices instead of feeling like they are being penalized for picking the Silver unicorn when the crystal one is empirically superior, or the Leaf codex when the observatory offers 25% more culture in the same space?
Again, if there is a meaningful trade-off of other features, like producing supplies, or materials vs culture or population, that's great. It offers people a meaningful choice for how to select. But to have two things that are different only in appearance and one offering more than the other is a terrible decision.
Anyone who picks the Leaf Codex instead of the Observatory is crippling their progress for esthetics, and this is bad prize design. There is no other way to put it.