From the wise-dome of Gary Barwin (whose 2016 novel Yiddish for Pirates casts everything in a new light [and things do seem mysteriously different lately, don't they?  That's because, to paraphrase Powys, if a book's illumination precedes, the unknown future into which it advances will luminesce]):

Q: Is two spaces after a period standard?

A: Thoughe suche standerds dost applye as have inne truthe beene borne from these oure moderne tymes withe its interynettes and wordly processores, I beliefe thate in one's owne hande and indeede in the londe of one's owne paypr, one canne scribe and thinke and write as thou doste wish. No dominione shalte have the grande hyghe worde auto correcte. The space tween fulle stoppe and firste letter whene the wordes againe beginne ist its owne a to izzard, ist thate bryghte espace tween sheepe and field, between star and earthe, thougyhte and possibilitie, bodye, soule, beloved, and tongue. Ist thate sweete silence when we holde our breathe in thee stilleness of wonder, inspiration, glee, or joye or greate sadnesse. In oure owne booke let thynges bee as we most wish, and damn thee the house style or moderne conventione. If I shalte desyre my bluebirds shalle have three winges in mine owne garden.