"
my feet
So tell me you believe in love
'Cause it's not an illusion to me
[Bridge: Niall]
You can tie me up in chains
You can throw away the key
But there's no trap doors, I&#039
The song was written about Liam Payne and his girlfriend. This bridge is using the metaphor of "tie me up in chains, throwaway the key; no trap doors" etc. to mean that he is completely, and sincerely hers, and that, no matter what, he will always stay by her side. It's not an "illusion", it's love - undeniable, unbeatable love.