Graduate students Cicely Shillingford and Veronica Grebe use templated capillary assembly to study the fabrication of square-packed lattices of spherical colloids on patterned templates. Conditions were found to maximize square-packed domains. Particle tracking methods are employed to monitor the assembly process and the conversion between square and hexagonal packing. A cyclical transition between 4 and 6 coordinated particles was found throughout the meniscus recession. The work is scalable and expands domain knowledge of the defect-free assembly of nonclose-packed lattices. Check it out here.