VERY TEMPORARY ARCHITECTURE
It has to be fast, literally overnight, unexpected, and fresh.
Pop up certainly is dynamic and usually in a high traffic area which would mean the pop up / knock down architecture employed would need to be really well considered.
I love the experimental feel, clever use of space, and use of common materials.
I haven't designed a pop up but would love the experience. If you have and would like to share the experience, please let me know about yours.