Glastonbury Grove is the circle of twelve trees in the forests near Twin Peaks.  These trees enclose a circular pool containing liquid which might be water, although it might be another liquid which smells 'like engine oil' (as suggested by the smell from Bob, and a container of this liquid provided by the Log lady to Dale Cooper, all of which feature during season 2 of Twin Peaks) 

I noticed the mounted lights around the glass box: there are three sets of two (one set suspended above, two sets on either side)  The backing of these lights is red and, to my eye, look a lot like red curtains.  That's what first prompted me to consider ways in which these two locations are parallel. 

The Grove surrounds the circular pool, but somewhere in between there is a rectangular shaped set of rooms.  There are two halves to the glass box, connected by a circular opening, which is also like a camera lens.  The glass box inside the room is surrounded by six mounted camera - a hemicircle. 

Obviously this glass box functions as a portal connecting with the place in which Cooper has been trapped, so I'm not sure to what extent it is helpful to draw attention to these particular similarities.

I also noticed how, when we see Cooper falling onto the 'outer' glass box, that it has thick X marks across its sides.  The two boxes removed from storage by Hawk, containing information about Cooper, are also marked on either side with X.