i just now fynded a game that features
a ‘10 degree of freedom interface’ to a 4D world: ‘adanaxis’.

the game, demo, and ‘tesseract trainer’ (in OSX and windos):
http://www.mushware.com/portal.php?page=4

context:
http://www.halfbakery.com/idea/Kata_2fAna_20Alter-Dimension_20Games

relevance to ‘bokeh’ metaphorics:
when “focusing in” from a 4D awareness to a 3D (locus), (the focus locus), one gets a kind of fuzzy fanout around the 3D world of interest. viz the ‘redshift’ in deepsky measurements: a ‘bokeh’ field that is similar to having a thin depth of field. the 4D surround gets “blurry” as space “widens”.

quote from ‘halfbakery’:
“If the 4th dimension can be expressed mathematically then a PC shouldn’t have too much trouble *calculating* it, you mean. Rendering is quite something different. Although… Maybe kata should be a kind of fading overlay of the object in one color (say green), and ana in another color (say red). This would limit how far you could “look” in those directions, just as much as your 3D eye is limited. Shimmering would be optional.” (!!) (!!!)