selga'e lujvo

x1 is sensed/perceived by x2 though sense x3 under conditions x4.

See also ganse, selzga.

In notes:

mirsi'o
s1=m4 is a notion of s2=m2 to cognizer s3=m3.
selgasrivbi
r1=g2 avoids being observed/detected by g1=r2 via senses/means (observer) g3 through action/state r3 (event) under conditions g4; r1=g2 is stealthy/cryptic.
selzga
x1 is observed by x2 through sense x3 under conditions x4.