Holcim said the project falls within existing port operations and the company has all the approvals required. It would continue to work closely with the Ports of Auckland and Auckland Council to meet regulatory requirements.
Ports of Auckland spokesman Matt Ball said it wouldn't stay looking like a boob for much longer, rather eventually turn into a giant piece of Lego.
"It might look like a boob now but it won't stay that way forever. I'm glad people are getting a bit of fun out of it. Personally, I think it's a kind of cool structure, yes it's industrial, but it's kind of a cool structure to have on the waterfront."
Mr Ball said Holcim needed a newer site as they couldn't bring their newer ships into Onehunga because the water was too shallow.
"They chose Auckland because most of the cement is going to be for Auckland, about 70 to 75 per cent of it, and then it will be distributed to the upper North Island as well."
Glenda Harvey, Country Manager Holcim New Zealand, said the construction of the dome was still in its infancy.
"The membrane shape that appeared in the Port of Auckland is the outer shell of what will become a 30,000 tonne cement storage dome. This is just the start of the construction process that will take about four months when the top of the dome will look considerably different. From here the team will apply a polyurethane insulation layer which will take just over a week after which they will start construction of the main steel and shotcrete layer that provides the dome with its strength."
Once the core is completed, the crew will build a concrete platform on top of the dome for dust control filters and the pipes that will transport the cement from the ships to the dome.
The Auckland terminal will provide effective access to the major market of the greater Auckland and the upper North Island while our other terminal in Timaru will provide effective distribution to the whole of the South Island market and the lower North Island, she said.
Around 75 per cent of the cement Holcim New Zealand will supply through the Auckland terminal is for the Auckland market.
"The project falls within the existing port operations and the company has all the approvals required. We continue to work closely with the Ports of Auckland and the Auckland Council to ensure all regulatory requirements are met."
It's not the first time erotic-looking projects have been erected in the city.
Some residents were gobsmacked by what they described as a penis-shaped cloud sculpture put up in New Lynn last year.
"It's certainly not a cloud," said Joy Dale of Mt Roskill. "It looks like a penis."