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the mark of cain inevitably does what it does, and dean with anger issues throws things(on a spree), but pauses after throwing the lamp, and then there’s the bloody sequence, where he kills people(on a spree), but stops after throwing cas( for a second, then there’s more throwing, but no killing, because cas can listen to dean and dean can listen to cas, even when possessed, gay love pierces through mind control and saves the day<3)
Cas is often forgotten, like the lamps in the room, but whenever time comes, they pray to cas( switch on lamp). And cas, gives dean hope, like a lamp.
Darkness is alluring, but Cas is like the lamp, light on the end of the tunnel, distracting dean from freakin AMARA( and she KNOWS)
Then there is the lamp, filling in the half of the bed, when cas would have been there, but he's most probably hiding from the angel army, which he gave up for dean. It's watching over Dean, just like Cas said he would. ANd Dean is listening to a mixtape( i guess there's more than one mixtape he's made for cas, but couldn't give it to him). So cas is here as a lamp when he can't be, and Dean is thinking of cas, with the songs he couldn't share with him.
Then there's the dance. Which is pretty much in character for us the audience, but obviously not the kind of Dean that Dean projects himself as. It's unrepressed, and even his clothing isn’t overtly butch (well its always a mix-match with a leather jacket and the samulet , long sleeves but men's jeans...), but here it's a white jacket and black trousers, worn with grace.
this is where not only cas is lamp, but dean loves lamp=cas is innuendoed. THe dream goes in stages, like the character arc and He enters the stage hesitant He enjoys and lets loose into experimenting with Garth, who knows Dean is a softie and doesn't care otherwise anyway. He grows comfortable. He then chooses to perform with the lamp, a male-coded partner. and then at the end of the episode, sam and dean watch garth slow dancing with his wife. perfect parallel, and dean says out loud, “i always thought i could be a good dancer if i wanted to be.” {dean yearns for a ballroom, i.e.romantic partner, and for a long time around this point in th timeline, the eye stares and moment's and quarells and memories and all thought trails in dean's pov are cas cas cas, so that's that.}
deeper readings: the lamp dance was, as much dean romance as possible, it was classy(like rock), and ambigous or covered up( chick - flick - moment - but - very - cloacked : dean^tm) . It also is a call-out to him embracing his true feelings in his dream, and as we also know, cas has access to his dreams(cough -cough), Also, he's dancing to a song about "misbehaving", and it's all romantic, so the innuendo is clear.
But details! The lamp shines in the corner of the bunker, like corners cas often stands in, (almost always ), and dean approaches cas, sorry this lamp, like the lamp that was once filling the half of his bed, He pulls the lamp out of where it had been tucked away, and looks over the lamp from all angles, much like looking over cas whenever cas comes back.
Bonus point- dance paces up in the end, like dean's love and calls to cas become haphazard and more frequent and involuntary in s15.
And voila- the he blows the lamp a kiss in the end. summing up this moment:
a tiny spot the difference:
and finally here's mothDean and lampCas. because if 15X20, then why lamp?