Strange last thoughts i have as the world ends

faces turned skyward
signal
no remorse

she left you alone
waiting
discarded

sunsets of fire
ignite
paradise

sunshine cat leaps
swallows
dive earthward

honour burrowed deep
flashburn
glass desert

sallow gerberas
cheap vase
corked red wine

retinal echoes
starburst
conflagrate

she left you alone
brevity
our lives meet

The soun has eluded and, at this late, late stage in the challenge – dare I even say it! – I fear it has bested me.
I have not been able to locate a clear or concise description or example of a soun. Good old Google believes I’ve made a typo and throws up ‘sound poetry’, even when I politely tell it otherwise.
Word of mouth tells me that a soun is an avante garde form of haiku – an idea I’m really drawn to. If anyone can help, please tweet me!
In the meantime, this, while not particularly avante garde by any stretch of the imagination, is what I have to offer as my third last poem of the poetry challenge.