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Comment by abrowne | Hacker News Reader

From Apple's Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter page http://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-us...

    As a bidirectional adapter, it can also connect new 
    Thunderbolt 3 devices to a Mac with a Thunderbolt or 
    Thunderbolt 2 port and macOS Sierra.

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But it's impossible to even plug it in: it has a male USB-C and a female mini-DisplayPort sized plugs.

Assuming the Thunderbolt 3 device has a type-C female on it, you could simply plug the TB3 connector on the dongle into the device, and use a TB2 male to male cable to connect it to the laptop.

I could never possibly come up with using a dongle that way, but you are right it can indeed fit when used like that at the device.

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