The LINQ aspect of Rx allows developers to construct observables. Here are some examples:

• Observable.Empty<>: This returns an empty observable sequence
• Observable.Return<>: This returns an observable sequence containing a single element
• Observable.Throw<>: This returns an observable sequence terminating with an exception
• Observable.Never<>: This returns a non-terminating observable sequence that is infinite in duration

The use of LINQ in Rx allows the developer to manipulate and filter the datastream to return exactly what they need.