To hang our head ostensibly — Cobweb Bird

To hang our head-ostensibly-1
And subsequent, to find
That such was not the posture
Of our immortal mind-

Affords the sly presumption 5
That in so dense a fuzz-
You-too-take Cobweb attitudes
Upon a plane of Gauze!
(F.160/J.105)
[1] hand, ostensibly:: spiders that hang in the air with threads.
[2] find:: the cobweb bird will take the threads.
[7] Cobweb:: cobweb bird, the Spotted Fly-catcher, using cobweb to build its nest.

An observant friend states that a nest placed against the unglazed window of an outhouse at Beechmount, was so composed of cobwebs inside and outside, that no other material was visible. From its choice of this fragile building substance, the spotted flycatcher is called cobweb bird in some parts of England. ─ The Natural History of Ireland (1849)