Business Course Four | How To Book Photography Clients: Concrete Vs. Flexible Pye Jirsa, 4 years ago Concrete Vs. Flexible Understand that in sales, the process & psychology are concrete, while how and what you say remains flexible. Previous Time To Get In The Ring Next Course Three Q&A Pye Jirsa Founding Partner of Lin and Jirsa Photography and SLR Lounge. Follow my updates on Facebook and my latest work on Instagram both under username @pyejirsa.