a quick search brings zero results so I wonder if this could be done in google sheets or if someone ever even attempted it...
background: basically it's a clock divided into 4 fields, where every field represents 1 digit based on the sum of randomly lit squares
which reads as 15:35
set time zone if needed
set recalculation on change and every minute
conditional formatting is set that font and background color are same for range B2:M4
custom formulae are simple for each of four colors:
=1=B2
=2=B2
=3=B2
=4=B2
and the main arrayformula in B2 is:
=INDEX(IFERROR(1/(1/{
VLOOKUP(SEQUENCE(3, 1), {SEQUENCE(3), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 1, 1), 1, 1, );
SEQUENCE(3-MID(TEXT(NOW(), "hhmm"), 1, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(3, 1), )}, 2, ), {0;0;0},
VLOOKUP(SEQUENCE(3, 3), {SEQUENCE(9), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 2, 1), 1, 2, );
SEQUENCE(9-MID(TEXT(NOW(), "hhmm"), 2, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(9, 1), )}, 2, ), {0;0;0},
VLOOKUP(SEQUENCE(3, 2), {SEQUENCE(6), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 3, 1), 1, 3, );
SEQUENCE(6-MID(TEXT(NOW(), "hhmm"), 3, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(6, 1), )}, 2, ), {0;0;0},
VLOOKUP(SEQUENCE(3, 3), {SEQUENCE(9), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 4, 1), 1, 4, );
SEQUENCE(9-MID(TEXT(NOW(), "hhmm"), 4, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(9, 1), )}, 2, )})))
for vertical tix clock:
=INDEX(IFERROR(1/(1/{
VLOOKUP(SEQUENCE(1, 3), {SEQUENCE(3), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 1, 1), 1, 1, );
SEQUENCE(3-MID(TEXT(NOW(), "hhmm"), 1, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(3, 1), )}, 2, ); {0,0,0};
VLOOKUP(SEQUENCE(3, 3), {SEQUENCE(9), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 2, 1), 1, 2, );
SEQUENCE(9-MID(TEXT(NOW(), "hhmm"), 2, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(9, 1), )}, 2, ); {0,0,0};
VLOOKUP(SEQUENCE(2, 3), {SEQUENCE(6), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 3, 1), 1, 3, );
SEQUENCE(6-MID(TEXT(NOW(), "hhmm"), 3, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(6, 1), )}, 2, ); {0,0,0};
VLOOKUP(SEQUENCE(3, 3), {SEQUENCE(9), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 4, 1), 1, 4, );
SEQUENCE(9-MID(TEXT(NOW(), "hhmm"), 4, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(9, 1), )}, 2, )})))
or rounded design:
=INDEX(IF(""=IFERROR(1/(1/{
VLOOKUP(SEQUENCE(3, 1), {SEQUENCE(3), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 1, 1), 1, 1, );
SEQUENCE(3-MID(TEXT(NOW(), "hhmm"), 1, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(3, 1), )}, 2, ), {0;0;0},
VLOOKUP(SEQUENCE(3, 3), {SEQUENCE(9), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 2, 1), 1, 2, );
SEQUENCE(9-MID(TEXT(NOW(), "hhmm"), 2, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(9, 1), )}, 2, ), {0;0;0},
VLOOKUP(SEQUENCE(3, 2), {SEQUENCE(6), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 3, 1), 1, 3, );
SEQUENCE(6-MID(TEXT(NOW(), "hhmm"), 3, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(6, 1), )}, 2, ), {0;0;0},
VLOOKUP(SEQUENCE(3, 3), {SEQUENCE(9), SORT(QUERY({SEQUENCE(MID(TEXT(NOW(), "hhmm"), 4, 1), 1, 4, );
SEQUENCE(9-MID(TEXT(NOW(), "hhmm"), 4, 1), 1,,)}, "where Col1 matches '\d'", ), RANDARRAY(9, 1), )}, 2, )})),,"⚫"))