The equipment photos here show Pilates towers made by Balanced Body. Towers can be made to attach to a wall, as you can see in the lower left. They are also commonly attached to Pilates reformers as you see in the classic wood reformer design, and the more contemporary design in the upper right. The woman and her instructor are working with a tower attached to a reformer (manufacturer unknown).
The tower has inspired some new designs for home use, many of which attach to a door. The new Tower on the Go from Balanced Body and the Pilates Stick are examples.Read my review of the PilatesStick
Read my review of Tower on the Go
Compare Prices on the Pilates Stick