The phrase "a sort of perpetual" is correct and usable in written English.
It can be used to describe something that is ongoing or continuous in nature, often in a somewhat vague or informal way.
Example: "He found himself in a sort of perpetual state of confusion, unable to make sense of the situation."
Alternatives: "a kind of endless" or "a type of constant".
It would be a sort of perpetual motion cannibalism.
But some critics suspect that Rap Genius's founders are engaged in a sort of perpetual parody of the music they claim to be rhapsodizing.
It's clear that we live in a sort of perpetual disconnect between the past and the future, in the sense that we assimilate little of what the present has to offer.
"They sit in stalled subways without claustrophobia, they extricate themselves from panic situations by some lucky wisecrack, they meet confusion and congestion with patience and grit -- a sort of perpetual muddling through".
The legal issues include whether hiding one's mistress should be considered a campaign expense (the government contends that it should) and whether, even after dropping out of a race, a candidate inhabits a sort of perpetual campaign, in which the money he takes and spends can be subject to finance laws.
The Atlantic salmon contains a growth hormone gene from a Chinook salmon and a fragment of ocean pout DNA that acts as a sort of perpetual "on" switch -- a combination that helps the salmon grow large enough for consumption in 18 months instead of the typical three years.
If such content draws viewers, it can be sold to advertisers, and newspapers have achieved a sort of perpetual-motion machine: cost-free content that can support advertising -- in short, nearly pure profit.
But I worry that I am being sold a sort of psychic perpetual motion machine.
To fill the resulting budget hole, the city simply invented more future parking revenues that would exist one forthcoming day, a sort of financial perpetual-motion machine that just goes to show that local officials have never yet found a road too long to kick a can down.
It's packed with school-hallway harassment, and city-street beatdowns, and church shunning, and workplace hazing, and brutal self-harm, and all sorts of perpetual, personal terrorism.
