February 2019's Unearthed Arcana gave us a revisited version of the Artificer class, a magic user whose magic is stored and accessed through items instead of invocations or eldritch power.
In the description of their Spellcasting feature is the following text (emphasis mine):
You have studied the workings of magic, how to channel it through objects, and how to awaken it within them. As a result, you have gained a limited ability to cast spells. To observers, you don’t appear to be casting spells in a conventional way; you look as if you’re producing wonders through various items.
A previous post implies that you have to be able to perceive that the creature is casting a spell in order to Counterspell it.
Would a traditional caster (sorcerer/wizard/warlock) be able to Counterspell a spell cast by an Artificer?
I'm not sure if the intent of this text is simply to add flavor, or if it is meant to imply that your spellcasting is imperceptible by normal means.
The relevant portions of Counterspell, for reference:
Casting Time: 1 reaction, which you take when you see a creature within 60 feet of you casting a spell
You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect.