The field of control and systems engineering is witnessing significant developments in the analysis and design of systems, particularly in the frequency domain. Researchers are exploring innovative methods to improve the visualization and understanding of system behavior, such as the use of qualitative Nyquist plots and scaled relative graphs. These advancements are enabling the development of more effective control strategies and vibration absorption techniques. Noteworthy papers include: Non-collocated vibration absorption using delayed resonator for spectral and spacial tuning -- analysis and experimental validation, which experimentally validates the spatial and spectral tunability of NCVA structures. Nonlinear Bandwidth and Bode Diagrams based on Scaled Relative Graphs, which introduces a novel graphical frequency domain method for the analysis of nonlinear systems.