They really need an editor. It's even worse than the syntax errors, saying something `felt more like a proof of concept [...] was immediately an impressive concept` is amateur wordsmithing. Better wording would be "Immediately, viewers were left with a strong impression despite the display being a proof of concept.`

> When Looking Glass Factory showed /of/off/s its first holographic display way back /on/in/s August 2018, it felt more like a proof of concept than anything — though it was immediately an impressive concept