Structure of exotic light nuclei. Z = 2, 3, 4

I examine the history and current state of knowledge of the structure of so-called ''exotic'' light nuclei with Z=2-4, from ⁷He to ¹⁶Be. I review the available experimental information and the models that have been applied to these nuclei. I pay particular attention to the interplay among energies, widths (or strengths), and microscopic structure. Throughout the presentation, I focus on a unified description of these nuclei. I point out contradictions within the data, and I suggest experiments that are still needed. (orig.)