His work
Both key conception for Alexander come victims of an 'emergent quality' & a idea of 'emergent evolution':

His project, when in any metaphysical theory, was to account for each aspect of existent reality in the simplest & virtually all economic basis. Alexander's idea wwhen to run by using Space & Instance every of which he take to be unimaginable forgoing a more, as a matter of fact he saw the babies as reciprocally tantamount. Away from this pure Space-Space-time continuum emerges, across the run Alexander describes only when 'motion', a stuff & matter that produce higher my poop globe:

Alexander absolutizes Space-Space-time continuum, & potentially speaks of it as a "stuff’ of which things are made. At the same time he also says that Space-Time can be called Motions -- not "motion" in the singular, but complexes of motions with kaleidoscopic changes within a continuum. So one might say that for Alexander motion is primitive, and Space and Time are defined through relations between motions.

Alexander asked the question:

The question went largely unanswered and his work is mostly ignored (or, at best, little known) these days.

Alexander was a contemporary of Alfred North Whitehead and mentored others who went on to become major figures in 20th century British philosophy.