Here’s the HAL-9000 view of my “bee yard” (a.k.a. my “backyard”).
My two latest nucs are on the far right. It’s a tight squeeze.
UPDATE: See the comments (from Rusty Burlew of HoneyBeeSuite.com) for information on how ventilation rims work.
February 2019: Here’s another view that shows how crowded my neighbourhood was and how small my backyard was when I first started beekeeping:
This was close to downtown St. John’s, just up the hill from St. Clare’s Hospital for those who know the area.