Nothwithstanding applications in physics and mathematics, infinity could be a semantic illusion.

According to the definition in wikipedia:  "Infinity (symbol: ∞) is an abstract concept describing something without any limit and is relevant in a number of fields, predominantly mathematics and physics."

Evidently, however, representations (and any possible representations, we wonder)  of infinity are either 1) a semantic or mathematical construction; that is, a conceptual illusion; or 2) an optical illusion.

Can something both exist and not have any limit?

Time? But time is a perception, a perception of change.

Space?  But, beyond star-filled space, can something that is "empty" go on forever and be said to actually exist?