There is in fact, a forward version and a reverse version of dependent origination. Rather than calling it the two sides of the same coin, they are more like heads and tails - two different sides of the same coin (of samsara).
This is the forward version which starts with ignorance (avijja) and ends with suffering (dukkha):
“Thus, bhikkhus, with ignorance as proximate cause, volitional
formations come to be; with volitional formations as proximate cause,
consciousness; with consciousness as proximate cause, name-and-form;
with name-and-form as proximate cause, the six sense bases; with the
six sense bases as proximate cause, contact; with contact as proximate
cause, feeling; with feeling as proximate cause, craving; with craving
as proximate cause, clinging; with clinging as proximate cause,
existence; with existence as proximate cause, birth; with birth as
proximate cause, suffering;
SN 12.23
And it continues with the reverse version which starts with suffering (dukkha) and ends with the knowledge of destruction (of ignorance):
with suffering as proximate cause, faith; with faith as proximate
cause, gladness; with gladness as proximate cause, rapture; with
rapture as proximate cause, tranquillity; with tranquillity as
proximate cause, happiness; with happiness as proximate cause,
concentration; with concentration as proximate cause, the knowledge
and vision of things as they really are; with the knowledge and vision
of things as they really are as proximate cause, revulsion; with
revulsion as proximate cause, dispassion; with dispassion as proximate
cause, liberation; with liberation as proximate cause, the knowledge
of destruction.
SN 12.23
OP wrote:
Shadow can be ceased only when the real object is perceived, if not
the shadow thinks it as real, even though it's unreal or non existing
thing! Previously perceived snake was actually the rope, when the
wisdom dawns upon. This shadow is false 'I', the illusion, the
non-existant thing. But only when one sees it with eyes of wisdom! Can
we say that?
This sounds like the language of Advaita Vedanta of Hinduism, and not Buddhism.
There is no true "I" that's discovered when the false "I" is removed, in Buddhism.
Buddhism teaches "sabbe dhamma anatta" (Dhp 279) - all phenomena is not self. Also please see Vina Sutta and Sunna Sutta. This means absolutely ALL phenomena, including Nibbana, is not self.