Single Light Source 1400+ is chiaroscuro reference: the figure lit by one key, with the shadow side left to be described by reflected light rather than opened up by a second lamp. The clearest way to learn how value reports form.
Light is the thing that explains form. With one lamp and no fill, every value on the figure is a statement about which way that piece of surface is facing — and the moment you add a second source, that statement gets contradicted. Single Light Source is 1400+ references built on the first arrangement, not the second. What's in this pack
Figure reference lit by a single key, with the shadow side left as a shadow. Nothing sweeps it open, nothing rescues the detail, and that is the point: the shadow family is described only by bounced light, which is how the classical painters worked and how the vocabulary below becomes visible in the first place.
Read across the set and you can watch the whole chain on one body: The highlight, where the surface faces the key directly. The light half-tones, planes turning gradually away — where most of the drawing actually happens. The terminator, the line where the surface turns perpendicular to the light and stops receiving it. The core shadow sitting along that terminator, usually the darkest note on the form itself, because no bounce reaches it. Reflected light filling the shadow from the surroundings — and, crucially, never as bright as the weakest light half-tone. The cast shadow, sharp where it leaves the form and softening as it travels, describing both the object casting it and the surface receiving it. Occlusion where two forms meet and nothing can get between them — under the jaw, in the armpit, where the thigh meets the calf in a bent leg. This, not the core shadow, is the true black. What you'll practice
Reference Pack reference pack on Refimages. Buy once, unlock forever — personal & commercial license included.