To us folk who are not used to miracles, or are not used to the power that we share with God, or the potential freedom of Christ, or the endless possibilities of immortality .... which is most of the planet including me, lol .... we consider miracles to be... "miraculous". Perhaps we are inspired by Jesus's work as documented in the bible and elsewhere. Perhaps we are in awe.
But the thing is, miracles only seem to be miraculous to those who are further removed from miracle-mindedness. And truly, miracles are actually completely NATURAL, and are supposed to be happening all the time. They are in fact supposed to be a normal mode of functioning, in which you have absolute power over all illusions and are subject to no limitations whatsoever, able to bring into manifestation anything you might desire in alignment with God's will.
So it's really a matter of perspective. We are just not 'used' to miracles, so they seem outstanding or awesome or .. miraculous... when in fact they are simply the natural, God-given inheritance that we all deserve and should be functioning in 24/7. Commonplace works of God.
Note that it's important to beware, of thinking that when the Course talks about miracles as. .. not a big fanfare.. it's not because miracles are NOT impressive or important or capable of overcoming all ego limitations, but because they do so ALL THE TIME and we're supposed to be functioning in a constant mode of miracle-working, such that it is second nature at the same time as being 'extra-ordinary'. Another word for this is, super-natural.
Here are some miracle principles from ACIM which back this up:
2. "Miracles as such do not matter. The only thing that matters is their Source." - i.e. they don't matter as such because they're not 'special', they supposed to be normal and a given.
3 "Miracles occur naturally as expressions of love." - Notice they occur NATURALLY, which means they are not really unusual and are supposed to be your normal mode of operation.
4. "Miracles are habits and should be involuntary." - Again miracles are something you can do all the time having learned the 'how' and are practically like just habitual, natural activities, rather than something out of the ordinary.
6. "Miracles are natural. When they do not occur something has gone wrong." - Again miracles are completely natural and indeed effortless and easy for those who are miracle minded. It is normal for the miracle-minded to perform miracles constantly. When this is NOT happening, something has gone wrong, and you can see that the profound ABSENCE of miracles in our lives indicates a LOT has gone wrong.
7. "Miracles are everyone's right, but purification is necessary first." - Miracles aren't for the few, or the special, or the one in a million. They're supposed to be commonly available and achievable by ANYONE. Everyone has a right to miracles.
10. "The use of miracles as spectacles to induce belief is a misunderstanding of their purpose." - I feel the point here is that if you were doing miracles all the time, to bring healing, correction, unlimited supply, abundance, etc... it would be pretty pointless to suggest that they are 'special'. To make miracles special requires that miracles are NOT always happening, such that when they happen it is out of the ordinary and something to shock and awe. When we are truly always miraculous, using miracles in this way actually works AGAINST miracles and suggests they are special and limited when in fact they are completely unlimited in their availability. See also principle 31 "Miracles should inspire gratitude, not awe."
15. "Each day should be devoted to miracles." Each and every day. Miracles. Every day of the year. Every year. Forever.
21. "Miracles are natural signs of forgiveness. Through miracles you accept God's forgiveness by extending it to others." - Miracles are natural signs of forgiveness, natural as in, how things are supposed to be, as determined by God's will for us.
So you can see, our natural inheritance is to be capable of performing miracles, every day, anywhere that they are needed or helpful. 'Miraculousness' is a state of being plugged into God's unlimited power source, his unlimited abundance, and able to bring that forth into any form at will, including the complete healing of sickness, reversal of death, manifestation of objects, being able to walk on water (if you so choose, might be fun), etc.
Once we are 'used' to our miraculousness and have accepted our natural state of being, unlimited and immortal, we would not think of miracles as 'miracles', but merely as, completely natural and a no-brainer. Easy peasy lemon squeezy.