| http://www.w3.org/ns/prov#value | - In general, in another aspect, the invention features an apparatus, including a housing having a first portion, a second portion, and a third portion configured to illuminate a first location within the housing with light from a first, second, and third range of ray directions, respectively, wherein light from the first, second, and third ray directions have a first, a second, and a third color, r
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