Here you can see the big 23-inch touchscreen and the pair of USB ports on the left side of the Acer AZ5700-U2112 along with the wireless mouse and keyboard.
The front of the Acer AZ5700-U2112 is silver and the black line you see is actually recessed, not just a line. What you can't see on this picture is that the top right corner of the AIO has the power button.
The back of the Acer AZ5700-U2112 is very nice looking. In fact, the backside is so nice looking it's a shame to hide it. All of the connectivity is on the rear of the machine with four USB ports, Ethernet, power, HDMI output, coax input, eSATA, and a plug for an IR blaster.
The right side of the Acer AZ5700-U2112 is where you find the slot loading optical drive, the memory card reader, and front ports for mic and headphones.