Learn English – meant by eye in “eye to the side” or “eye to the sky”

The context relates to coils of flexible pipes.

Coils can be loaded eye to the sky, eye to the door or eye to the side. Usually loading coils eye to the sky is not so problematic, as the coil weight is not so high and the weight is better distributed.
Loading eye to the side is the common method and usually used for the heavy coils.

A
ll guidelines like weight distribution, bedding,
blocking and lashing
have to be followed
by
all
stuffing
methods
(eye to sky and eye to door)

Also, Coils of pipe may be positioned in an “eye to the side” or “eye to the sky” orientation. When the flexible pipe is coiled and is disposed with its interior channel facing upwards, such that the coil is in a horizontal orientation, then the coils of pipe are referred to as being in an “eye to the sky” orientation. If, instead, the flexible pipe is coiled and disposed such that the interior channel is not facing upwards, such that the coil is in an upright or vertical orientation, then the coils of pipe are referred to as being in an “eye to the side” orientation