through-the-fence operation?

[GeorgeC]

Apparently this is a peephole for planespotters:

 

[Baked Potato]

For camera lenses I guess? Like they have at hockey rinks.

 

[Ashara Keliyn]

For camera lenses I guess? Like they have at hockey rinks.

Yes, KVNY has those too.

 

[asicer]

Knotholes are a thing in baseball.

 

[midlifeflyer]

Hopefully low enough for the next generation of aviators.

 

[GeorgeC]

My son pointed out that Beta has one of their chargers there, too. That might be nifty for EAS, among other things.