This is an altar I created because I got bored one day. I wanted to turn an entire glass table into a scrying speculum and gateway of sorts. I put it to good use for some time until I conjured Tiamat through it. At that point it shattered.
I’ve had good sucess with my Skrying mirror and had thoughts to place it directly above my altar as the center piece. The only problem however is that my alter is currently in my bedroom, so I have had 2nd thougths about establishing a demonic gateway right infront of my bed haha