Black holes are perfect sources of black-body radiation, as no energy can escape them. The closest thing we have to these here on Earth are the post office on a busy day and Ikea.
Ikea is what I am going to focus on today, as once an object or living thing goes in, it does not come out. This is a quality fairly unique to Ikea and certain fabric stores (but only if you are a child with your mom). Ikea stores always seem bigger on the inside, and even getting close to one has risk of drawing you in.
It is true that people are known to leave Ikea (granted, hours after entering). But they have not entirely left Ikea. Part of their soul still remains. Their inner light if you will.
No light, inner or otherwise, can escape from an Ikea. Ikeas are also known to spread but so far there are no recorded incidents of two Ikeas merging with one another. Not yet at least.