It's a Bird! It's a Plane! NO! It's a SUPER AD!
Share an image of a sign/ad with a key concept in action.
You heard it here first folks!
The Amazing SUPERMAN in PRINT!
Hear of his greatest exploits and his most dastardly villains!
Ahh, the 1960's. I remember it well. It was several decades before I was born and DC Comics were coming in HOT with Superman! The key concept here may not be very identifiable at a glance, but with the aid of Superman's X-RAY VISION, I'll shed some illumination! The concept I'm highlighting here is audience, and for a big reason.
When you think of advertisements, what do you think they are trying to promote? "Hey, I know you're having fun over here, but we paid the service you're on to tell you about our product that we have over here!" It's usually advertisers pointing to their product through other products. You see it in baseball stadiums telling you to get Geico, you see it on billboards telling you to read a bible or you'll combust, you see it on YouTube telling you to shop at Temu or vote one way or another (election season amirite?). But one ad that you might not think about are the HOUSE ADS!
Out of all the advertisements, I, personally, find them to be the most wholesome. House ads are advertisements that promote internally. That is to say ads that promote themselves. In comics, you'll see regular ads for shaving products or even Geico again? Are you kidding me, how are you everywhere? But when making comics, the editors will intentionally leave blank space to put those pesky little Geico ads in there. But, occasionally, there will be spaces that aren't filled by Geico and nobody is paying for ads there. So they will do some self-promotion! This has two big purposes. One is obviously is to fill up ad space since they can't just have a blank page, but the other purpose is to get the audience excited and wanting to learn more about other series that they are putting out. So it gets consumers interested in other products that they are selling. And since they're already reading comics that they bought, they're more likely to give the advertisement a try as it is typically more of similar products or content. Who better knows their audience than the people who already have them hooked?
(Heya, I got a lot of info, as well as the Superman image from author Dan Greenfield at this link. I wasn't alive at the time of the ads posting, but it is fun to learn about them from the perspective of people who were around at the time! Give it a read, it's really interesting looking back through time!)
Source: https://13thdimension.com/paul-kupperberg-my-13-favorite-1960s-dc-comics-house-ads/