For the home collector, growing multiple specimens of the same species also has the advantages of simplifying watering and care routines, and having "backup specimens" in case one of them dies. But the true joy of koten engei lies in appreciating the subtle differences between various cultivars. For instance, a neofinetia collection might consist of a typical wild specimen; a cultivar with short, thick, "bean" leaves; one with twisted, "ocean wave" leaves, and one with yellow-edged variegated leaves. Each one, sitting in its pot, will have a very different feel to it. Each one will grow differently, and respond differently to the same cultural conditions, even though horticulturally they're all the same species. It is possible to start thinking about each orchid as an individual, rather than as one of a thousand genetically identical clones.
Although it goes completely against the grain of this article, I can't resist mentioning a few choice hybrids. Dendrobium monoliforme, crossed with Den. tosaense, aka stricklandianum, becomes Den. Ise, a common parent in many compact nobile-type hybrids and worth growing in its own right for its fragrant, pink-tinged flowers. The hybrid of neofinetia and sedirea, Neosedirea Summer Stars, is very rare, but try seeking it out. Sedirea has been hybridized with holcoglossum (formerly vanda) amesiana to produce Vandirea Newberry Jasmine, with excellent fragrance, temperature tolerance, and frequent blooming. Rhynchorides 'Dragon Charmy' combines sedirea with rhynchostylis gigantea; it has dramatic, reddish foliage and reddish-marked flowers and is described as intensely fragrant.
For more information on these species and their growing requirements, there are a few nurseries to look at on the web: New World Orchids specializes in these three species and has a ton of cultural information. Cal Orchids and Orchids Limited both offer many different neofinetia cultivars. Finally, Japanese orchid show and society pages, available on the Web, are not often translated, but beware: the beautiful pictures can really get you hooked.