>>3970274>Construction is for when you don't have reference Dumbest meme I see on this board. Most artists use some form of "construction" lines to lay-in and design their drawings a lot even when they're drawing directly from life or reference.
Loomis meant for you to apply his construction methods to real models to help you draw more accurately and and understand life drawing better - because its far more manageable to work from the general to the specific. Hell, you use construction of sorts even when you're copying a Bargue plate via sight-size - blocking in the "envelope", silhouette of the figure, the shadow shapes and its features, adding construction lines to measure proportions. Same concept.
Sight-size itself is just a tool, a way to set up your subject and your drawing so its easier to judge proportion/measurements. Its not a completely separate mode of drawing.