Which knot is used to form a temporary eye in the middle or end of a rope?

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Creating a secure, fixed loop anywhere along the rope requires a knot that builds the eye from a bight rather than tying at the end or making a sliding loop. Bowline on a bight does exactly that: you use a bight to form a bowline around the two strands, yielding a stable eye in the middle or at the end of the rope. This eye stays the same size under load and won’t slip, making it reliable for attaching gear or passing through a ring or carabiner. A regular bowline makes a fixed loop only at the rope end, and a running bowline creates an adjustable loop that can slide, so neither is ideal for a fixed eye in the rope’s length. A generic knot or hitch isn’t specific enough to reliably produce the required eye. So the bowline on a bight is the knot designed for this purpose.