I've had the pleasure of meeting and talking with David Wilson on a few occasions, may he rest in peace. As a recording engineer, a music lover and a speaker artisan, his knowledge and passion shined.
It was always a treat to listen to some Wilson speakers and some of the recordings that Peter McGrath would also setup and demonstrate at one of my local dealers from time to time.
The WASP system is indeed a brilliant approach to speaker positioning and I try to imitate it with my own setups, mostly with very good results.
W.A.S.P explained
https://youtu.be/UOI8py0DAC8