How can a color display with three monochromatic lasers produce a finely rendered colorspace, with what seem like the appropriate pastels and everything?

This is because our eyes cannot tell how a stimulus is made. We have three types of cones in our retinas and as long as the energy absorbed in the three types is equal for two stimuli (e.g. A pastel made with paint and illuminated with daylight vs. a pastel made with three lasers, then the colors will match. This is the definition of metamerism, which is the basis of modern colorimetry.

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