How to add a-frame objects to the scene

[felipereigosa]

Hey guys, I'm very new to hubs development and am trying to add a simple a-frame box to the world, mostly to understand how everything works. When I add a box entity to the scene in src/hub.html, I don't see anything. And I know the box is inside the scene because if I inspect the scene in the console I can see it. I set the box to visible, why wouldn't it be showing? Is there a more complicated way to add objects to hubs besides the declarative a-frame way? I know it's a noob question but I'm just trying to get situated, I've tried searching for previous questions but none helped me, or at least I didn't understand the ones I found. Could someone point me in the right direction? Thanks.