Spatial variation of physical parameters may induce rich phenomena, which can only be realized in artificial structures by meta-materials and cold atoms. Non-uniform flux associated with particle blocking is an example, as shown in our recent paper, “Blocking particle dynamics in the diamond chain with spatially increasing flux” by Tomonari Mizoguchi, Yoshihito Kuno, and Yasuhiro Hatsugai. The paper has been published in Phys. Rev. A 109, 053315 on 22 May 2024 (accepted on 2 May 2024). Also see arXiv:2308.03971